I really would like to know, how many travelers take breath taking photos during their trips and they don't know that you can make money with them.
Of course, it requires some work and time and the money will not flow in immediately, but it is worth a try and really interesting.
There are photo stock websites all around and they will take and register you for free. If you have a good digital camera with around 8 megapixel and you took good photos of your trip, you can download the best ones under your name and if a customer of the website likes it for a book or some advertising, you will be paid money for your photo.

When you register at those websites, the stock agency wants no money from you, but you need to show them some good photos you took recently and then they decide if you can have a spot on their website.
I did it and it is really worth it.
Below I list some links to such photo stock websites, check them out and read the info and good shooting on your holiday, because you might end up earning money while traveling.
www.photographersdirect.com/
www.anypix.de German website!

ps: search the web for photo stock sites. There are plenty around, like "istock" or "Travellibrary"