This is fun to try all year round as it is covered. I would recommend getting into red ones as they have Bluetooth speakers. Totally worth $33 as it covers the round trip.
Besides skiing in Aspen, there are many other things to do especially in the summer. If you like hiking, definitely try hiking to Maroon Bells for these stunning views.
If you love driving and admiring the views, I recommend driving over Independence Pass. This is the route that leads to Aspen. it's not the fastest, but gorgeous views.
If you are into adventure sports like me, then you got to try whitewater rafting in Aspen. It's seasonal so do check before you book your trip. Bring a GoPro if you have one.
Aspen Art Museum is conveniently located in downtown Aspen and also has one of the best views besides hosting some amazing exhibitions. There is also a rooftop cafe.