A friend and I did the Beneath the Streets After Hours tour, which is the 18+ tour offered at night. It was quite good. Our tour guide was Mike and he was extremely entertaining and informative. Mike was high-energy and definitely able to captivate our attention. As a great story-teller, he seems like a perfect fit for this job (he’d be a great teacher as well!). On the tour you learn quite a bit about the history of Seattle, particularly the Pioneer section and waterfront. Since it was the adult tour, we were able to learn about its seedy past as well. We learned a lot of interesting tidbits! Mike pointed out a number of landmarks that still remain and historical sites. It was not a strenuous walk. There were some steps to enter and exit the various underground spaces, but there weren’t that many and they were spaced apart (like you don’t do them all at once) so I think this would be easily suitable for most people. We thought it was a good tour and reasonably priced.