All depends where the walleye are biting that day. Since you are trailering, best to launch close to the fish. Catawaba State Park would be the "central" most ramp, you can go either west, north, or east from there and be about equal distance from where the walleye typically are in June. If they are in the South Passage, them Mazurik would be best. Out off the main reef complex then head west to the ramps down around Davis Besse, or launch from the Portage River access in Port Clinton. There is another ramp on Catawba Island that takes you out West Harbor. Have your ramp list and location and pick the ramp closest to where you will be fishing.