At the beach or at the park, a comfy tush cushion is all you need. Lightweight, portable, durable, and available in many nifty designs, these chairs are designed to accompany you on outings without encumbering you. One even includes a cooler, which is...darn cool. Go ahead, sit and break out a cold one.
When I'm at the beach, I must have a chair with a cupholder. Call me fussy, but I just can't stand getting sand all over the bottom of my beverage.