I know it's colder water than we have here in SF bay, but there's NO WAY I'd leave a boat in a slip all summer without bottom paint. Even if you're using it regularly, you're going to get growth.
But more important than growth, I'd worry about the drive. You'll be in a slip, which means other boats with unknown electrical conditions as well as possibly poor electrical on the docks. More times than I can remember I've seen drives eaten alive in less than a season by a hot (electrically) boat sitting a few slips down from them. And look as close as you want in the water, but you're going to have a hard time seeing the start of corrosion without pulling the boat out and washing the drive. Ask MOP - he's an old salt water guy with plenty of experience; I bet he's got plenty of horror stories of his own.
If you were on a mooring out by yourself I'd be much less worried about corrosion, though I'd still worry about growth.
Ideally, I'd try to find a hydro-hoist to keep her in. Scan craigslist or the local boating rags; I bet you can find a used 5000 lb lift pretty reasonably. They're easy to use and eliminate the growth/corrosion problems completely.
Don
'01 22 Classic, 502/B1
And a bunch of other stuff
"If everything seems under control, you're just not going fast enough" - Mario Andretti