We are a group of 3 (29, 31 & 60), planning to visit Glacier National Park in June/July/August. We're thinking about flying into Kalispell airport & arriving late Friday night (11pm) & flying out on Monday night (6pm) - just 3 days since we couldn't get more time-off. The rental cars cost about $60/day & it seems only Alamo & Enterprise have availability. If we're staying at a hotel with an airport shuttle, is it possible for us to skip getting a rental car & still be able to explore many sights at GNP with a shuttle or local bus? If not, maybe just rent out a car for 1 day?