doofus who gets badly burnt: steve rogers.
doofus who only gets burnt only once before using sunscreen and asking tony to help get his back: steve rogers
doofus who, after getting rubbed down with lotion in the middle of the beach, disappears for an hour and is later spotted walking back over a dune with mussed hair, conspicuous red marks, and a dazed smile on his face: steve rogers
doofus who spends the rest of the afternoon with a self-satisfied smirk on his face: tony stark
bruce gets knocked over by a rather large wave, hulk is seen splashing at the water before getting lost in the tide (they are unsure if he’s trying to take out his anger on the water, or if he’s simply playing) and is later found a couple miles down the beach covered in seaweed and laying in the sand as if he’s sunbathing, a seagull perched on his knee.
clint ‘accidentally’ loses his bathing suit. the accident, of course, being him thinking he could get away with throwing natasha into the water.