This was okay, but but may have been superseeded with a city pass. I paid for the most attractions but becareful as the Aquarium has been removed, though it is on the City pass
Loved the flexibility that the Explorer Pass allows. Did eight different activities -- would recommend all except the Gray Line Scenic North Side and Historic South Chicago bus tours - had the same tour guide on different days - Antone - who was more interested in sending texts and spending time on Facebook on his phone than he was in telling us about our surroundings, history, etc.
Architectural Boat ride and Hop On/Hop Off tours were a must!
Pass worked for our schedule. save us time at the time of arrival to some attractions.