Burke's provides rentals for canoeing & kayaking the Russian River. However many of the sporting good stores in the Santa Rosa, Guerneville, & Forestville areas sell inflatable inner tubes & rafts so you can also buy there & enter at Steelhead Beach Regional Park on your own, just make sure you plan out having another car situated where you end the rafting trip so you don't get stranded.
About a 30 minute drive north on HWY 101 from Sebastopol & Santa Rosa is the Dry Creek Valley & the town of Healdsburg. Alyssa's wine club, Martorana Family Winery is a must visit (Amista, Mauritson, Truett Hurst, Unti, Bella Vineyards & Wine Caves, Quivera, Ridge Winery, Mazzocco, Lambert Bridge, & Passalacqua are other favorite wineries to try out). The town of Healdsburg has incredible restaurants & shops. If you find yourself visiting Healdsburg you have to stop into Noble Folk Ice Cream & Pie Bar, you won't be disappointed!