If you're just looking for something to cool down after a tiring day, or something to beat the heat, a Sorbet is what you've been looking for. But don't go confusing a Sorbet, with a Sherbet.
You see, a Sorbet can simply be considered as a type of "Italian Ice", whereas a Sherbet is a dairy based, fruit flavored ice treat.
Since I know dairy based products are not everyone's thing, and many people are just looking for a lower fat alternative, Sorbets fit the bill quite nicely.
Coupled with the fact that the actual preparation time of sorbets is so ridiculously short, preparing them takes nothing out of you. In fact, the only thing that should be bothering you is the time you have to let it freeze!
Now have fun!