While not directly providing income it allows saving. Trusted House Sitters offers the best options for homeowners and sitters, but you should also consider HouseCarers.com and MindMyHouse.com. Additional resources include Couchsurfing, HostelJobs, Workaway, and WorldPackers.

Seasonal Work

From bartender to divemaster, from boat steward or hostess to gardener you can pick up any job involved with the pre-season or tourists season of the place you like. Consider also teaching your own language or English; take a look at Green Heart Travel or Italki.

Qualified Work

If your skills are in demand, you may secure a professional internship. Try Alliance Abroad.

Taxes

If you find a regular job, remember you have to pay taxes in the country you work, but you have to show your home country you have paid for it. For instance, as an American working in France, you still have to file with the IRS to show that you have paid French income tax.

Why am I supposed to wear more underwear than a boy?

Well, although in some way they are, this is not the type of scam I'm referring to. Check my page on travel tips.

Don’t judge other customs. You are a visitor. Be respectful.

Try to Be Flexible

Delays do occur while traveling, as well as other issues (baggage, taxi, hotel bookings, etc.). Try to understand the situation, explore your alternatives, think about the consequences of yelling.....

Consider to Make a List

I mean a real one, not in your mind. Think about what you're going to do and what you'll need to fully enjoy it, but think also about what you really need if things go wrong.

Try to Learn some Words in the Destination's Language

It may help in order to appear not as an invader but rather as an interested traveler. However, much depends on existing conditions and historical developments. At least, take a look at the news. Good candidates are: Thank you, I'm sorry, Water, Wine, Food.

Consider Purchasing Travel Insurance

Depending on your existing coverage, you may integrate it with a travel insurance (about 50-100$ for 2-3 months).

Remember to Make Copies of Documents

Important documents are passport, driving license, scuba licenses, and prepaid tickets of all sort. A couple of photos suitable for such documents are good too, just in case you need to make a new ones at your embassy!!

Underwear

• For boys: don't use it while traveling, it prevents irritation.... Pack a couple more.
• For girls: always wear it, it prevents irritations.... Pack 3-4 more than usual, quick dry.

Don't ask, it's a complex physiological answer.

Keep some space for style

You should consider some locations may require more than shorts and t-shirt even if you are a well paying tourist; you may need also to look presentable.

Always Enquire about the price

You'll not result as rude or rough as you may think. It's just a precaution. Remember to explicitly ask for all fees and taxes.

Consider Drinking Water on Planes

You should drink a liter of water every 4 hours of air travel. I know, it's better to get drunk and sleep but it's really dangerous. Water will help with jet lag too.

Reflect on Locals' Suggestions

Locals are an important resource of information about restaurants, spots, entertainment, etc. However, not all locals are happy with tourists, as well as not all locals give suggestions for free. read my page about Travel Scams.

Consider Negotiating Rates

You may try to bargain a bit with accommodation, transport, and souvenirs. It can take time but it saves a lot in the long term!

Consider Informing Your Bank

It will prevent your credit card company or bank to put a hold on your card.

Keep Cash Separate

Take with you small notes (5, 10, 20 usd), always separate your short term needs from the remaining.

Exchange Currency in Banks

Avoid airports and tourists desks, they have high commissions, faulty calculators, and bad rates.

Try to Book Flights in Advance

The earlier the better, but 8 weeks in advance is the perfect time to book your flights. Consider also miles program and lounges. Prepare well on connections, always consider a 2-3 hours delay.

But Leave Room for Spontaneity

Don’t plan your entire itinerary ahead of time. You never know who/what is expecting you.

Currency Exchange

People at the counter should be honest, but it is not always the case. You may appear tired or sleepy and instead of some help you'll get counterfeit bills and hefty exchange rate.

Petitions

This is common in city centers where people comes up to you asking money to support their cause. Please do your research on the web and don't do too many questions unless you're searching for troubles.

Childs

Who can resist to selling children offering for few pennies jewelry or a service; however, be sure in first instance they just sell objects or services because in some countries they may offer drugs or sex. Generally, someone older is profiting from their conditions. If you care, advice authorities the day you leave

Street Vendors

Obviously they will charge you more than locals. Apart from bargaining, you can find a local and give him some money to manage your "affairs" with street vendors and other.

Robberies

Someone will try to steal your possessions after distracting you in some way, usually by swarming you or by causing a scene. Keep your belongings close to you and never loose sight.

Taxi

Usually they take the longest way or switch off the meter to overcharge. Always check the route and fare before entering the taxi,you will notice that only the honest will listen to you. Uber is the best alternative and is always cheaper.

Street Games

Just avoid any type any time any where unless you are a professional gambler with a big wallet.

Credit Card Scams

Depending on the case, someone will try to get your credit card number, safe code (the one on the back), and sign to buy or get cash from an ATM. In some countries you can be forced to take cash from multiple ATMs. Take care of yourself and of your credit card by avoiding small bank branches, by checking the credentials of people accessing your card, and by generally showing concerns about using it.

Free Stuff

Usually tourists are seen as big wallet walking around just waiting to be opened and deprived. The most common scam is the offer of some free stuff to later ask money and cause a scene if you don’t pay.

it seems you know a lot about it.....

I'm waiting for more!!

Cheers

1. Rented your spare bedroom (if any). It may yield you between 300 and 800 dollars per month (tax free!).
2. Work overtime or find a second job. Ask neighbors and friends if they need help with something.
3. Fix a budget for yourself. Anything that isn't a necessity should be considered entertainment. 
4. Downsize and consolidate. Cut on mobiles, internet, cable tv. Sell things you don't need anymore because you are a frequent traveler.