Sacramento lies at the confluence of the American and Sacramento rivers, and rafting on the clear blue water of the American is popular, especially on warm weekends. Several Sacramento-area outfitters, such as American River Raft Rentals (11257 S. Bridge St. at Sunrise Ave., Rancho Cordova; 888/338-RAFT or 916/635-6400; www.raftrentals.com), rent rafts for 4 to 15 persons, along with life jackets and paddles for $15 to $25 per person. Their shuttles drop you upstream and meet you 3 to 4 hours later at a predetermined point downstream.