My summer tactics are:
Mainlake structure like humps and points, docks, laydowns, and over-hanging trees during the day. I use tubes (1/4 oz jig stuffed inside with hook exposed), grubs (1/4 oz jig), spinnerbaits (3/8 oz in white/yellow), and X-Raps (XR10s in perch or rainbow trout).
In the early morning and night (sunset really) I stick to mainlake humps with surface lures such as poppers and walkers.
Good luck!
Chad