well Im with the rest of the group. Im up marten river way in a couple weeks and i will be fishing early morning/ late nights but if i have to fish daytime i would go deeper. try jiggng for walleye and smallers in 20-30 feet of water. I would stay away form top water baits during the day as I find it really works best in the early morning or evening when the lake calms down a bit.
But seriously, stay out of the sun and heat and enjoy a shady spot with some pops. That is what I would do in this heat.