"if you want to do it mainly for fun and get some pocket money out of it"
LOL. That tends to be the story of most of my sites!
I have a site already that is a guide to living in the place, which does ok. It makes some money from hotel affiliates, which is why I thought to try and move more into the travel side. I understand it is competitive but at the same time, there are lots of sites that look like they were made in front page, but seem to rank very well in Google.