Bogus is the closest ski and snowboard resort to Boise, at only about 40 minutes up the mountain. They provide cabins, a full lodge with food and a bar, gear rentals, snowshoeing, and tubing.
They are open at night too, often times offering discounts on rentals and lift tickets.
Bogus is also open in the summer. They offer mountain biking, hiking, a roller coaster, and other attractions.