My friend and I had a really great experience with the explorer pass. We chose it over the CityPass because it gave us more options. The only downside is that we didn't have skip to the front of the line included with the Skydeck admission. But it wasn't that big of a deal. I highly recommend the Big Bus Tour and the Architecture River Cruise. Museums were fun, but both those tours were definitely the highlight. We also had a bit of trouble using one pass on the river cruise because a Shoreline employee scanned the pass twice and incorrectly told us we had already used the pass for that location. We had to come back the next day after calling Viator customer service, which was really frustrating. Other than that though, great experience!