If you like to fish, this is a great place for it. You'll need to have a California fishing license, which you can buy at the sporting store in downtown Guerneville. You can buy licenses of varying length, from one day to a year.
Once you have your license, you just have to know that all year round, you may only use barbless hooks (crimp any barbs on your hooks) when fishing in the Russian River. And at certain times of year, you may only use lures -- no bait -- for fishing.
This little guy was caught on a canoeing trip, where Mark was just idly casting his line and lure. It's a small mouth bass. And yes, we caused as little pain and released him.