Brandywine is an incredible place to sled. Short ride to get into the alpine, and basically endless amounts of terrain to access. You can burn all your gas in a day here easily. It costs $20 a day to sled here. $15 if you are a sled club member. Make sure your sled is registered as the police are known to lurk the parking lot (and even the alpine) for unregistered sleds and beers.... not chill.
The main zone is Brandywine Meadows which has many cliffs and pillows to hit. You can also access Metal Dome from the meadows. From the Meadows, you can take either S Chute or the Gauntlet to access Grizzly Lake and the Ice Cap... where the real adventure begins.
An alternate route of accessing Grizzly Lake is via Chocolate Bowl. This way is actually quicker, but its less fun. Do not go this route on avalanche danger days as you pass through a zone fittingly called Avalanche Alley. It's also the easier hill climb... preferable if you are doubling a novice or something.
Once you get to Grizzly Lake, it is a simple roop to access the Ice Cap. It's huge and vast with access to many zones to shred and sled. There are tons of natural halfpipes that are super fun to sled around here too.
Back at near the Meadows, there is a cabin that is quite nice. It used to be open access, but now you have to make reservation through http://www.powdermountainsnowmobiling.org/ which is kinda heinous. I believe they should reopen it to all, its a safety issue in case you get stranded out there and need shelter.