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Underground Seattle
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You should def buy your tickets online in advance. The line can get pretty long, and I wasted about 30 minutes waiting, which could've been spent exploring!
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Try to catch the 1:30 PM tour if you can. The tour guide was really engaging, and I overheard that the later tours can feel a bit rushed. Also, take your time in the gift shop after!
Miyar Adventures
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I recommend bringing your own gear if you have it. Rental prices add up quickly and I wish I'd packed my own stuff. It's totally worth the hassle!
Alpine Ascents International
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If you're renting gear, my advice is to check their rental prices online first. Some items can be pricey, and you might find better deals elsewhere in Seattle.
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I recommend booking your courses at least a few weeks in advance to snag a spot especially for popular classes. They fill up fast and you'll save yourself some stress!