If you’ve never given it a try, the Russian River is a great place to spend a few hours floating down stream. It’s free, it’s very shallow, and during the summer it’s very slow moving. This is not river rafting.
In the section between Steelhead Beach and Monte Rio the river is slow and steady. From Healdsburg to Steelhead you’re better off in a Kayake or Canoe where you can make up for the insanely slow river. The river depth is