Make tons of coins real fast with air time bonuses. In just a few short minutes you can have upwards of 250,000 with very little effort. A good run can get you around 2 million plus. Want even more? Fipping in the air while stalling from low gravity will help spent your time more wisely earning rotate bonuses as well. Just make sure to balance yourself out for impact before landing so you don't crash. A good rule of thumb for flipping is that you can almost always do it once safely in a jump at least one time. Sometime you will spin wildly of a hill when hitting it right, it's okay to let it do it's thing for a bit before gaining control for landing.