if you struggle for wind, which you may, go for a trip to Sherman Island, short trip inland from SF that is where the wind hides and all the locals go, cheapest campgrounds in CA to. Cant help with hire sorry
I looked into hiring gear in SF but tricky unless you get lessons. I had a surfboard lesson with the nice folk from Boardsports who teach at Alameda across the Bay from SF. The lesson could have included all the gear but in the end I used my own kites etc. I talked to them before I left about hiring gear & they said they'd be happy for me to hire a board but not kites etc so I ended up taking all my own gear to SF. I thought the best wind was at the 3rd Avenue spot near the San Mateo bridge so was good having my own gear to go there. Good luck.
