Seaside and inlet beach go east on rt 98 to you see rt 30a it a great road go from blue mountain beach to rose mary beach great place I have been going there for 15 years my sister owns some rentals there. Sea side is were they made the movie The Truman show staring Jim Carrey it's a very cool beautiful little beach town. You can't take a bad picture have fun and great time.
I would stay away from the amphitheater except at near daybreak. When I flew at the beach I used the Palaya public access just to the east of Seaside. Drew plenty of attention but, again the early morning you will have it to yourself. I flew 3 different video and picture gigs while there for houses and people looked but, no questions.