As that is after Memorial Day, some schools will be out by then but a lot of So Cal schools don't get out until June. It should definitely be possible to get on all the coasters and Lex Luthor without a Flash Pass, but you will probably not have time for many re-rides. It is possible that Twisted Colossus will be open by then, but given SFMM's recent history I'm guessing a late June opening is more likely.
Alright sweet! Plus I'm expecting at least 1 or 2 rides down for the day, so hopefully I can get a lot of rides in on one day!
I'm just praying that it isn't like the time I went to Cedar Point. It rained off and on the majority of the day. Luckily I got on MF in the morning and then TTF finally opened up at night so I got a ride on that. Maverick was the only coaster closed all day though. And it was the one I was looking forward to the most.