We were walking around before going to the theater and saw people lining up for the gondolas. I found the ticket counter and found out it was about $15/person. The four of us went on the inside tour as the outside one was closed. It was very romantic but I think my girlfriend and I had a better time than her sister and mother. Still, it was worth giving it a try and I'm glad we did it. I'd be interested to come back and try the outdoor one. I recommended this to a friend and she was proposed by her boyfriend to on this ride! And said yes!
Pros: romantic, unique
Cons: long wait