I have fished there in the early fall a few times, there always seems to be some Bluefish in the surf, casting any good bait imitation will do or top water pencil poppers, of course casting a surf conditions will dictate when you can cast into the surf.
You may also want to try the inlet at OC and the Indian River Inlet in Delaware. both can hold all kinds of fish and each can vary with each incoming tide. I have caught Blues at each.
I'm sure there are lots of opportunities in Assawoman Bay but I have no experience there, hopefully someone else will sound in.