Mountaintop Summer Picnics; Accommodations. ... Open Trails. Save time & less contact – Download and sign the Summer Activities Release before you arrive. The trails are for hiking and biking only; motorized vehicles and horses are prohibited. The trail is easy to ride. The Powder Mountain trails are open to the public. ... and there’s so much to explore and experience whether you like to ski, ride, dine, or jam to live mountain tunes. Just 30 minutes from Salt Lake City and with over 1200 acres of winter and summer fun, your Utah mountain vacation awaits at Solitude! Plan out your day before heading to Park City or navigate the mountain while you're at the resort with the latest Park City trail maps. The Summit Series was founded in 2008 by 20-something co-founders Elliot Bisnow, Jeff Rosenthal, Brett Leve, and Jeremy Schwartz.. Today, Summit’s invite-only events attract thousands each year