Yes you can get tickets at the door, just easier to get online you can also get same day tickets. I purchased my families tickets online an hour before going
Yes that's actually the norm
Yes you can
Yes
Yes... we got them as we arrived. No problem at all.
Yes, however tickets seemed to be less expensive when you buy online and a day or a week prior to your tour at the caverns. I suggest buying prior to your trip. If you buy tickets online the day you are going, you are getting same price as if you're buying at the door.
Yes you can, but they are a little cheaper if you get them on line. And you can schedule a time for your tour
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