I don't think the beach is conducive to profound thoughts. Maybe the rhythm of the surf crashing and the tidal movement lulls your mind into dullness. Maybe it's all the beer. Whatever the reason, my level of conversation rarely progresses past "Hey, pass me the sun block" as I act as a human sundial by adjusting the position of my chair to follow the shade of the beach umbrella.
One observation that I make every time I go:
Most adults never go into the water. My family seems to be the exception because we all think swimming in the ocean is great. Just get out beyond the breakers.