BONUS Small Biz Saturday Bounce & Play from 1:00 - 3:30 PM!!! Missoula Indoor Sports Arena (MISA) provides Missoula County and the surrounding area with its first state-of-the-art indoor sports field. We also have an inflatapark park consisting of large inflatables such as playgrounds, obstacle courses, slides, and a bounce house that provide fun, active entertainment for children of all ages.