Night on Holiday Island:
Holiday Island is always played during the sunny hours of the day. However, you can change that by flying into the small cave with the river flowing from it near the castle. The best way to do this is to use the jetpack, because it is easier to maneuver. Once you fly to the end of the cave, a sound will ring indicating that you have now changed the time to night. Enjoy the full moon and windy conditions of the nocturnal landscape.

Warp from New York City to Los Angeles:
As you are flying around Little States with the jetpack, you can warp from New York City to Los Angeles. In New York, there is a big greenish building. It's front doors are open (it's the only building that you can enter in NYC.) Go through the narrow hallway, and once you emerge, you will be in Los Angeles. This saves you a lot of cross country travel.