Nipfisher hit it right on...
In past years my wife and I booked in mid July knowingly the heat would be on but then again so is the bite. I would venture out about 6.30am in the morning and fish till about 10.30am with the intention of targeting muskie.
After that I would go back to the cabin for breakfast and prepare to take out my wife for a mid afternoon of fun fishing and swimming around Tombstone and a couple other spots where theres lots of smallies,largemouth and pike.
Evenings for me meant walleye on the shoals. I got a few spots that I like to visit that have weeds to rock inclines which I fish at about the thermocline anywhere between 17 to 22 feet of water. This seems to be the the depth they like to turn on the feed bag in and it usually starts around 6.00pm and ends when you here the first mosquito buzzing around your head around 9.00pm. Within
minutes of that point you will be eaten if you don't get off the lake.
Good Luck !!