When it comes to spending money, experiences trump objects. But why aren’t we applying this aphorism to gift ideas for the holidays? This is the gift guide that does just that — offering packaged experiences that are mind-blowing, adventurous, or just plain fun. From an overnight trail relay to a personal island in the Adirondacks, these are not the kind of gifts anyone will ever have trouble forgetting. Be warned: These are once-in-a-lifetime trips, and many come with once-in-a-lifetime prices, meaning you should probably pool your resources if you’re giving them to one very special someone.