Itasca State Park Campground is located near Park Rapids, MN. The trail is primarily used for camping and is accessible year-round.
Great Place to camp
This is one of those places you must go and see for yourself if you find yourself in Minnesota. There is a 17 mile bike trail going around the lake, boat rentals, cabins, campgrounds, and tons of wildlife. I had a skunk run right up to me while I was sitting in front of the the camp fire (Thank God I didn't get sprayed). You can even walk across the headwaters of the Mississippi river. The only down side to it is the extremely bad mosquitos. Wear light-weight long-sleeved shirts and blue jeans to salvage as much of your skin as possible. I left with around 30 bites on my arms and didn't bother counting my legs (I was only there 1.5 days).