Thefed.. just personal taste, but your original list sounds a little sickly sweet to me. Especially for the beach, my favorite summer drinks are G&Ts and Seabreezes. A gimlet or CapeCodder is also nice. Vodka/tonic.. even a TomCollins with the sour mix/gin would not be bad. Mojitos good but you need the supply of fresh mint.
That said, I am planning some margaritas for a BBQ tomorrow. $20.76 for a 700ml of Cuervo reposado (sorry - the only tequila in the store). Cointreau. Lime juice. Ice. Salt.