Ask HN: Make money w/o banner ads or subscriptions

I've been helping work on a website www.kayak411.com and we just had a major re-release. We're not really doing it to make money or a company, we just like kayaking. It would be nice to make a little money off of it just to cover hosting costs + a little (think craigslist). So, we're looking for really creative ways to make a little money without sidebar/banner ads or subscriptions. So far we are planning on getting a cutback on camping referrals and maybe a small fee to list things in the marketplace.

Anyone have any other unusual ideas?

www.kayak411.com