Joe,
Caesars & Spring Valley both hold annual blind draws. If you draw one, it gives you permission to erect a blind for the season at a specified location. Spring Valley marsh isn't much (never has been),and is an extremely shallow & small man-made impoundment that is electric motor only. Small gravel ramp at the south end and the heavily used Miami River public bicycle trail runs up the length of it's West side not a stones throw from the marsh. Most days, you'd be likely to have a recreational kayaker paddling through your set [
] . Nice place for a walk as well. Caesar's or East Fork Reservoirs. are big but tend to be over-hunted and will be tough to hunt once they draw water levels down each fall if you don't draw a blind location permit.
Indian Lake and Grand Lake, St, Mary ( + Mercer Wildlife Refuge on Grand lake offers goose blind drawings all season) might be more in your driving range, and you might consider the Ohio River; but going North to the Sandusky Bay area, you'd be travelling a long way from the Dayton area just to get there (...think 31/2 - 4 hours). I'm about 30+ miles
south of Dayton or Wright Pat., and it's over an hour's drive for me to get to decent areas to put in at & hunt along the Ohio River where it's bordered by either Ohio & Ky / or Ky & Indiana. The bulk of my hunting is done on the Ohio on an Indiana or KY non- resident license. Being sure to have the right license is a major consideration on the Ohio + any embayments or tributaries. Regardless, of what will work for you travel-wise, getting out to scout in the summer is going to be a must so you can familiarize yourself with areas, ramps, etc.
Field hunting or lakes on private land may be your best option - that or getting access to the Great or Little Miami, Mad, or Stillwater Rivers through private land ( it's going to require landowners permission to access smaller Rivers, as Ohio's regs on water rights are
really prohibitive (...you can't just float down from an access point and set decoys as landowner owns the river bottom too). Good Luck.