Many people start travel blogs promoting a particular destination that they are passionate about. They then try to get a few dollars from it, via adsense and affiliate programs eg with accommodation bookings.
Another way to get some return from your effort is write a guide and sell it either as an ebook or as a printed copy> this is much easier than you may think. There is a service which gives you a template to write your guide, intsruction on how to use it to make a guide then a platform to sell the guide, either as a pdf file or as a Print on Demand paperback.
The cost? Nothing, until you start selling then they take a modest commission. You can even sell other guides as an affiliate.
Darby Higgs