Maybe some Temptations cover band giving a concert in Chene Park for the boomers I'm assuming cruise the Great Lakes to listen and dance to, a Motown Music Spectacular or somesuch? Since the terminal is, apparently, located close to Chene Park, and it makes sense to highlight the riverfront.

I've only been on one cruise, and that was in much warmer climates, but I had the impression the cruise line acted sort of as a middleman for snorkeling trips and such that they basically resold to their guests at, I'm sure, a markup. In a similar vein, bike tours and Segway tours and walking tours, and trips to the DIA or the Charles Wright museum [[with proper coaches, not DDOT ;-) and even the Henry Ford, or tickets to ball games, or buckets of discounted casino chips, all these things I imagine they would arrange on their own.