Sorbet is the best.
There is a brand called 'Rice Dream' that is made from rice milk. It's freaking fantastic. But I have only tasted the chocolate flavor.
Have whatever you like. Just carry a fan around with you for a few hours.
Soy or rice. Rice is better but harder to find.
sherbert, some frozen yogurts- and there is a brand called lactaid-ice cream
No Ice-cream......... but you can eat sherbet or yogurt