July on the lake off Sandusky is wonderful. With your Mac you should be able to get pretty close into shore to anchor. You can anchor off the beach at CP and the kids can swim and play off the beach. During the week it's easy to get a dock at Kelleys or PIB, weekends are tougher. A nice sail is out to the North side of Kelleys. You can anchor in the cove and play on the beach. Great place for lunch. If it's too windy for the bay, sometimes you can sail between Sandusky and Marblehead Lighthouse. The land knocks the wind down a lot along there if it's blowing that direction. There is a new marina downtown since you've probably been there last. Between the ramps and downtown is the Paper District marina. Reasonable, clean and close to most stuff downtown. Shower facilities as well. Another choice could be CP Marina if you're planning to go there anyway. Not cheap though. I think I spent about $160 for two nights with my 29 footer. If you're there on the weekend look me up on dock 336. You can grab a dock or mooring ball for about $40/night most places. If you're headed to PIB, check out the state docks at Oak Point. No power or water, but only $20/night or $10/day. Restrooms close by at the park. It's back in behind the mooring balls. If you head out to PIB on the weekend, and it's busy, don't worry, head across to Middle Bass. You can dock at the state marina there and take a $7 ferry ride over to PIB. MBI marina is nice and a lot more quiet than staying at PIB. Cost of the mooring ball at PIB includes the water taxi service, which makes it a good deal. Come on up and sail. enjoy yourself and don't worry about sailing after 4pm. Thunderstorms don't happen everyday, it's not Florida, just check the weather reports you'll be fine. As for the algae, don't let that scare you off. I can only remember a couple of days in the past 8 years of sailing that I didn't want to get in the water.
JerryA