Ask everyone te meet, "Hot enough for you?"
Sing the "Barney" theme song as loud as te can.
If te see kids building a sand castle, say, "That's not a real castle!"
Every time when you're about to anatra under the water, yell, "Down periscope!"
Go swimming in a full business suit. If people notice, act like they're the weirdos.
Put sea shell to your ear and announce to first person to pass by, "It's for you!" Repeat several times.
Throw jellyfish around.
Tune radio to all-news station and blast as loud as te can, then nod your head and snap your fingers like you're listening to some happenin' tunes.
Act like a sea gull.
Wear t-shirt that says, "I'm the coolest dude on this pathetic beach. No autographs please."