Not much to add but will second what others have said about the R23 being a great little boat for SF. Used to have a pretty active one design group way back when as well. Tides, check. It's pretty straight forward, but the currents are very strong. Temp check for the right side of the Berkeley Hills, check. The hotter there, the harder it blows in the slot. One thing not mentioned much or in big enough letters is the need for really good foul weather gear in the Bay. On a little boat in the summer, you absolutely will get wet. Being cold is dis-functional and dangerous. Latitude 38 publishes an annual "how to sail in SF Bay" that outlines a usual lap and talks about the general conditions you'll find on a typical summer day. Oh, and watch out for the South Tower demon (GG Bridge). I think everyone who's sailed in SF has gotten spanked at least once by the bugger.