Starved Rock State Park near Oglesby is the most visited state park in Illinois, and for good reason. Eighteen sandstone canyons cut into the bluffs along the Illinois River, and waterfalls tumble through them after rain. Trails lead to overlooks, deep canyons and quiet forest, and the historic lodge offers lodging and dining. In winter, bald eagles gather along the river, and frozen waterfalls make the canyons especially beautiful. Camping and picnic areas make it easy to spend a whole day here. There is no vehicle entry fee, and camping fees vary by site, from $8 to $45 per night. Weekends can be very crowded, so visit on a weekday if you can.