True, you cannot stay at a Young Life camp outside of a scheduled camp, and you would go through your local Young Life area.
I don't believe you can just "book" a room, you'll need to sign up for one of their public camps or events. The cost is dicated by the event usually $150 per person for a weekend retreat. Week long camps for kids $400+ They don't have alot of "public" events as the camp is used nearly year round for private church retreats. Check out the website for more info.
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