Another way to find this information is to do a simple Google search. For example, one could place the following phrase into Google Search: “(product name) + affiliate program”. (Replace “product name” with the name of the product you are promoting.) There is an interesting chrome addon called Affilitizer is available which makes this process easy.
If you have built up an email list, you could also promote your affiliate offers via email promotions. Just make sure you build up a relationship with your audience first instead of going for the hard sell straightaway. The emails you send out must contain your affiliate links to products so when your audience click through. the sale is attributed to you.
There are also a lot of customization options. You can integrate hotel booking sites into your website, choose specific destinations, and showcase properties that interest you. For example, you could start a niche affiliate site about “Denver Family Vacations,” write content about the top things to do in Denver, guides about the local area, and promote specific hotels.