Assateague
Spent many vacations on Chincoteaque Is. parents had a place in Toms Cove there, that is where you want to be, drive over to Assateaque for the beach etc. short distance. saw pony swim many times, it's sad! and Is. get's very crowded (no place at the Inn so to speak)at pony swim time,great seafood restaurants, and of course you can buy fresh seafood, we went out on the water and got our own, fishing,crabbing,claming etc. Have fun!
P.S. Toms Cove is a big campground.