Another great way to make a little extra money, for your travels. Is through your hobbies. I love to take pictures and am starting to do some photography on the side. It's something I enjoy doing and can bring in some extra money that will fit nicely in my savings account.
A great site to sell things you create with your hobbies is Etsy. I have a friend that crochets and could sell here beautiful blankets on there no problem. It a great venue for selling handmande and vintage finds (in case your hobby is junking).
Take a look at the things you like to do and see if there's an avenue for making extra travel money.