Cream ale is the refreshing beer that the mass-market American lagers wish they could be. When I brew it, it's not anybody's favorite beer, but everyone likes it at least somewhat in hot weather. Wit's a good choice too, and when next summer rolls around I'm probably dusting off my honey wit recipe (short version: make a witbier, dump in 6-8 pounds of honey at flameout, hop just a tiny bit more than you would normally do for a wit, and warn people about the gravity).
Or you could do what I did for this August: a Belgian tripel with a honey adjunct instead of the usual sugar, and push it up to about 10%. Don't warn anybody, if you're feeling cruel; brewed right, you can get a beer that's got the refreshing body of a lighter cream ale and the gravity of a barleywine. After a day of exercise, it hits you like a rock.