Aries Woods offers an easy accessible gladed area with a wide variety of terrain.
To enter, ride up the Comet Express, exit left, and look for the big overhead sign/gate.
Upon entering, simply explore! The trees are close enough to offer a challenge to fast-moving advanced skiers but not so dense that intermediates or first-time glades skiers will get too intimidated.
Keep an eye out for exposed (or very slightly hidden) tree stumps that will damper your fun.
If the trees prove to be too much, simply exit right to Orion or left to Comet.