i had the five mtn pass last winter and i love park. but coming from ohio, i was trying to spend as much time as possible in the back country. that being said, abasin has some excellent access to some side country via the palli lift as well as some sick stuff down past montezuma. it's a relatively easy hitchhike back to the lift as well. i definitely spent most of my days riding abasin and it's surrounding bc. when it was sunny and warm though, keystone was definitely my favorite for park and general resort shredding. sure it's relatively flat, but i had a ton of fun ripping around that place last winter. i really liked their park compared to breck. the feel was considerably better because of the park lift. you got stoked the whole time you were there skiing the park and then watching other people shred the whole way back up.