Will you have fishing boats too? I will be up there 5/17-5/21, remind me to post some info before you leave.
Fish will be anywhere from 3′ to 40′ of water. We fish water with shallow bays that has deep water nearby. Any large point or narrows will also concentrate fish that are moving from spawning areas to early summer spots.
If I had a houseboat and only 3 days (assuming you are going out of Vermilion Houseboats in Pike Bay), I would go NE out of Pike Bay and find a quiet spot on the N side of Pine Island around Bear Creek.