There are several locations to launch a boat in the Great Egg Harbor bay/ocean City area. None of them are very Hobie friendly.
As mentioned by JoseyWales the Beesley Point Municipal ramp between Route 9 and Parkway near the Tuckahoe Inn. There is a daily launch fee and a long pier at the ramp to move the boat past. The beach next to the ramp is a swim beach (no boats) but very close to the Parkway end there is a location to beach a hobie.
Somers Point Municipal Ramp, at J.F. Kennedy Park, Sommer Pt. Daily launch fee, pier at ramp and very small beach that disappears at high tide.
Corson’s Inlt State Park Boat ramp at the southern tip of Ocean City. Daily launch fee, pier at ramp before you can get the boat to a beach and a narrow channel to the ocean.
Each of these locations are marked with a "i" on Google Earth.