I myself run a travel content site with 1milion unique users, and I have tried many ways to monetize my traffic:
1. adnetwork - simple and quick to get an ad code and put it on your website/ pages you get CPM per click that easy money, you can choose a pop ad with admaven or their native banner types they offer.
2. Adsense- Simplest and quickest also. Can give you easy money. (but not that fast) - has though a 2 months delay in payment..
3. subscribers/ partnership - You can charge various travel users or businesses.