We loved going to The Entrance--especially loved renting their pontoon boats as they would meet you in St. Joseph Peninsula State Park with the boat! When we visit Cape San Blas, FL we stay in Barrier Dunes, so that meant we only had to go 2 minutes to get to the boat and then again to return home!
If you need rental items (except the larger boats), we like Scallop Cove (the BP on the Cape). They carry just about everything, rent kayaks, grills, beach chairs etc. and have the best bait and fishing gear around--they offer good fishing tips as well!