My most fun in a helicopters, is a tie. First one of my favorites is a night cross country in a R22, on a full moon night between Oahu, Lani, and Molokai islands in Hawaii. Truly an amazing experience. Other had to be at 10k + over the coastal mountain range just NW of Skagway AK. In my experiences it was the most beautiful view on earth. Hundreds of miles of spectacular mountains and glaciers. Google maps/earth it. Really cool. Only other pictures I have seen that compare are of the Himalayas in Nepal, which are too tall to have a birds eye view of in a heli. I have been very lucky to have been able to see such things!