Be very careful when you take flight. You'll only be able to fly through the air for a very limited amount of time. When the timer's close to running out, make sure you have plenty of forward momentum - if you're heading straight up, chances are the avalanche will catch up to you when you finally land.
While you should definitely jump over any rocks that are blocking the path up ahead, make sure you run right through any Adventure Time friends you come across. Touching them will cause you to gather them up or ride them, providing you with all kinds of useful boosts.
It's OK to bust through chalets in Ski Safari, and in fact, you'll even get a speed boost for doing so. Ride right through them to get a nice boost of speed that will keep you one step ahead of the ever-approaching avalanche.
If you do find yourself coming a cropper at any point during gameplay, make sure you tap the screen as fast as possible to get your character upright and moving again. You must stay ahead of the avalanche, and every extra second counts if you're after a new high score.
Try to avoid running over the green blobs found in certain parts of the terrain. If you can land on this stuff from a decent height, you'll be given a second big bounce when you land - this can be really useful for making it through a tricky patch without taking a single knock.
If you want to earn more coins in the game, try to complete as many of the mini-missions you're given as possible. You can track your progress of these by using the pause button in the top right-hand corner of the screen, or by tapping the Missions icon on the main menu.
Don't forget to check in at the upgrade store from time to time, as you can spend some of your hard-earned coins on upgrading the various characters in the game. Sometimes the best way to make more coins in Ski Safari is to spend more coins.