Take a train ride, tour the night sky and more at Minnesota state parks during the Fourth of July weekend. Although most of the electric campsites are booked, approximately a third of the reservable campsites without electricity are still available. In addition to those sites, up to 30 percent of the campsites at every Minnesota state park are nonreservable and available on a first-come, first-served basis. The nonreservable sites include some with electricity. To reserve one, call 1-866-85PARKS or 1-866- 857-2757 or visit stayatmnparks. com.

Friday, July 3:

Universe in the Park, 10 p.m., Lake Maria State Park (Monticello): Join the University of Minnesota Astronomy Department for a spectacular tour of the night skies and an opportunity to view the celestial sights through provided telescopes. Meet at the Visitor Center.

Stargazing, 8 p.m., Rice Lake State Park (Owatonna): Members of the Steele County Astronomical Society will set up telescopes and interpret the night sky. Meet at the shelter in the picnic area.

Saturday, July 4:

Historic Buildings Tour, 10 a.m., Fort Snelling State Park (St. Paul): Learn how the buildings along Hwy. 5 were used throughout the history of our state and nation. Meet at the ball field parking lot on the corner of Colville and Taylor avenues.

Big, Bad and Beautiful Bugs, 2 p.m., Wild River State Park (Center City): View an assortment of insects,

including a giant millipede, a "friendly" tarantula and more. Meet at the Visitor Center.

Sunday, July 5:

Antique Train Ride, 10:45 a.m. - 3:30 p.m., William O'Brien State Park (Marine on St. Croix): Take a one-mile walk, then board an antique train for a tour of the St. Croix Valley. Bring lunch or purchase food during a stop in Osceola, Wis. Meet at the Visitor Center.