Have you ever been to Collins Lake or Lake of the springs? Both are filled with hill run off not snow like little grass Valley so a little warmer. The boating you mentioned I like Lake of the springs better swimming is great in both.. hiking Lake if the springs has a trail we love right by the boat dock keep following it till you get to dog beach. So pretty. Collins is really busy, vault toilets, $2 for a few minutes shower, boat rentals start at $22 I think. While Lake of the springs has larger camping spots, free showers and all flushing toilets. Boat rentals start at $6. Both are about 1.5 hours from sac or less..