Singleton Beach is near the Disney Resort. You pass it to get to the resort on 278.
Forest Beach is down by Sea Pines. Go to the Traffic Circle,take it 3/4 of the way round, go around the next traffic circle and you are there. It's rather nice place.
HHI beaches aren't known for surf...they tend to be calm. Tybee Is, down here Savannah way, has more waves, and people.