Many do not seem to comprehend what a tour operator does or is. You can choose it up at different points around town consisting of Old Town, Seaport Village, the Gaslamp Quarter, Balboa Park, the zoo and now even Coronado. The bike courses are recently laid and give you the leisure to delight in the view anywhere you wish to, apart from the typical Lake Mead views etc.
You can take the whole trip in Madrid at one time or throughout the day you can leave or on. Tickets for those tours cost 38 PLN per person despite chosen language. The excellent news is the Colorado River isn't simply a course of rapids, some stretches of the river have really quiet and smooth waters. The dominant language is mandarin and Taiwanese Hokkien.