I've never been here, but this looks like fun. Lake Merritt Boating Center is having their “Splash Into Summer” Open House on Saturday, July 13 from 1 - 3 p.m.
Seems like worth checking it out. The event flyer is here:
They also offer a 3-day class, "Basic Small Boat Sailing" for only $132 (only $110 for residents), which is a real bargain. And an "Advanced Small Boat Sailing" 2 days for $96 on JY-15s and Lasers:
I've also read that they have parking!
I won't personally be attending, but this sure sounds like an inexpensive way to get started on smaller boats, and could be a whole lot of fun.
This is a free event! If anyone checks it out, please post a review here.