The ferry ($21 roundtrip) drops you off and off you go. Depending on the size of your group, you'll quickly get annoyed with the single-file jammed up pace, so turn right at the first fork in the trail to go to Hell Roaring Falls and escape that. It's a 1km sidetrip that will link you back up to the group, but they'll be a little bit ahead. You'll likely reach a bottleneck at the tunnel (not a crawl, more a hunched walk) and then again at the cable. Be patient. The etiquette of yielding to people coming uphill isn't really followed here.
We took the 10AM ferry. It took us four hours to get to Crypt Lake and we burned down the trail, getting back in under two hours. Keep in mind if you do that, you might end up having to wait for the 5:30PM ferry as people with 4:00PM tickets get priority.
Overall, the hike is a steady incline, you gain quite a lot in elevation but it's not overly challenging. Great views, very rewarding hike.
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