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But I have been limited by NDL, on some of those trips, and on others I might have been limited by NDL if I hadn't been buddied with an air hog. I think it's worth it to show up with Nitrox for the first dive.
Solo diving is totally kosher; I've never even had to show my card. As far as dive shops on Avalon, I've only used Catalina Divers Supply, aka Scuba Luv. They have a trailer right next to the stairs, behind the Casino building, where you can rent gear, fill your tank, and hook up with a guide. Their guides are mostly very experienced instructors who know the park intimately; I can't speak highly enough of my experiences with them. I think there are a couple other shops in town; I've just never used them.
Parking at the Catalina Long Beach ferry terminal is easy, but $19/day. It is gated and covered. There’s an elevator that opens directly across from the terminal where you enter. They take cash or cards. Never had any issues when parked there.
No, it’s not.
You should do all you can to stay in Avalon. You won’t save money by commuting by ferry and staying in an LA hotel. My 2ct.