Mount Rainier National Park offers excellent opportunities for scenic drives, hiking, and mountain climbing. Most roads are open from late May to early October, and all provide stunning views and access to a variety of hiking trails and other sites.
While many visitors attempt to "see the park in day," you may wish to concentrate on one or two areas of the park and explore them in detail. Keep in mind that parking is limited on sunny, summer weekends and holidays.
I recommend having your binoculars and camera ready, but please, never stop on the main road to view wildlife. Pull over and drive carefully!