Lost Creek State Park (tel. 406/542-5500), a few miles outside of Anaconda, is a great place to camp or hike, or simply sit and admire the scenery. At the end of the road into the park, a short path will take you to pretty Lost Creek Falls, which tumble over a 50-foot drop. There are also mountain goats and bighorn sheep in residence. Several hiking trails lead off from the road. Among the most interesting things here are the rocks. Exposed on the tops of some cliffs is the 1.3-billion-year-old Newman Formation, a Precambrian rock that's among the oldest exposed rocks in the Lower 48 states. This is a primitive park, without services (and without charge). There are 25 campsites, suitable mostly for tents and car campers. To get to the park, drive 1 1/2 miles east of Anaconda on Mont. 1, then 2 miles north on County Road 273, then 6 miles west on Lost Creek Rd.