Family activities near Assateague Island/Ocean City

We did a week at Assateague National Seashore a few years ago. Some of the highlights were the ranger led programs, mini golf and boardwalk in Ocean City, farmers market and an afternoon in Berlin. Mosquitos were pretty bad when we were there, so we didn't use our bikes at all. Good news is they didn't follow you past the dune, so beach time was nice. My kids were about the age of yours now. I think the most fun they had was chasing those silly little ghost crabs around at night.