I like American Wheats in the summer. I have an awesome Oberon clone recipe that is on constant rotation during the summer.
I also made an attempt at cloning Great Lakes Holy Moses which is a Belgian wit. It wasn't spot on Holy Moses, but I think I actually like mine better? It is also damn fine with a wedge of lemon squeezed in it and will also be a nice thirst quencher on a hot summer day.
I also had a blonde ale recipe that I made into an Apricot Blonde and a basic American wheat recipe that I turned into a Strawberry Wheat and both are very refreshing summer beers!