If you like big crowds an concerts an alot off drinking, I'd recommend checking out there white knuckle event. Usually around 30 thousand ppl on that mountain for a week long event. If not most any other time would be fine. You all will a blast either way. I don't Go to the White Knuckle events for the simple reason I don't want my kids around a bunch of drunks. Have been to one event and had a blast but no kids just not a good environment for little ones, and they managed to have a fatality at each event mostly due to alcohol.
Book a date that the cabin is open for you can stay close to the trails. Never a bad time for riding.
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