I didnt know that Treasure island has a winery. We took a day trip from Oakland. 5 miles each, a short nice cruise on 4th of July. Grilled burgers on the boat, took a walk around to discover a winery and did some wine tasting.
It was nice cruising under the new bridge still under construction. If I had a dinghy I would have hung out on the small beach there.
Anyways...lots of fun.