There is no such thing as summer in San Francisco. (Your heater’s on and you’re wearing cashmere. In May.)

Before you reach a boiling point, head to Marin to check out Cavallo Point, Fort Baker’s new adventure resort-meets-national park, which opens in June. The restored early 1900s property covers 45 acres of Golden Gate views — an ideal setting for a romantic jaunt or group getaway.

The lodge has activities galore: cooking school, spa, and healing arts center. Pony up to Farley Bar, wine and dine at Murray Circle, or chill at the outdoor fire pit. Do morning yoga in a chapel on the hill or party down in the grand Callippe room.

The other details are great, like sustainable components, impressive artwork, and pet friendliness. Out-of-towners can catch a ferry into the city from Sausalito.

Though that’s beside the point.

Cavallo Point, 601 Murray Circle, Fort Baker, Sausalito (415-339-4700 or cavallopoint.com). Book an adventure or program between now and July 1, 2008, and receive a complimentary stay for one evening.