Related Clues:

• Calculus calculations
• Skiers' sites
• Isn't on the level
• Spots for skiing
• They're not on the level
• Slippery slopes
• Places for schusses
• Some trails
• Gradients
• Green circle and black diamond, e.g.
• Vail trails
• Ski surfaces
• Downhill paths
• Aspen attractions
• Winter vacation destination