Multi-select problem: How does the next paragraph end?

Skiers walk and stand on skis at the bottom of the hill at of a ski resort. kids

Choices: +stand on the steep hill watching the skiers get on and off the skis. +ride on inflatable tubes down lanes on a ski slope. +walk and stand on the hills at the bottom of the hill. +sled in the slopes through the ski resort.
ride on inflatable tubes down lanes on a ski slope.