The combo pass can save you money if you are going to be in the area for multiple days. We used the bus to save walking time, and get out of the heat. You should go on the whole loop at least once to get an overview of the city,. The narrated bus tour tells about the sites and history along the way. After that, we used the hop on-off feature to get around quickly.
The river cruise is included. One cruise on one day is included.
The Tower of the Americas was also included in the package. One admission day is included, but you can do it more then once in that day. The view of the city and the surrounding area is good. Since the riverwalk in one level down from the street, you cannot tell where it is easily.
The real decision to or not to get this combo pass is how often you would use the buss portion. SInce we used it multiple days, it saved us some time and money.