This was the fifth or sixth time I've been to the top of the mountain-- other times I hiked up through Tuckerman's or drove up on the auto road myself. The best way to go, however, is by van. It is not cheap but considering the wear and tear on your vehicle plus the need to be very attentive to driving (there are no guardrails) it is the best way to see as much as possible. I'm a history buff so learning much of the history of this place made the trip and the overall experience very delightful. I highly recommend this trip-- it truly is a "mountaintop experience."
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