"Lake Berryessa shimmers just east of the Napa Valley, a 45-minute drive through gorgeous countryside from Rutherford — and it's well worth the trip. One of the largest bodies of fresh water in California, it offers boating, water skiing, wake-boarding, tubing and other fast-paced water sports, plus quiet coves for kayaking, swimming and fishing. In the summer, the water can reach 75 degrees — the perfect cool-down after a hike or a stroll through sun-drenched vineyards. Pleasure Cove Marina offers boat launching, boat and jet ski rentals, houseboat rentals and boat gasoline, as well as camping options."