My husband and I stayed here with our infant sons for 2 nights for the Riverbank 25K run.
When we arrived, the valet and bell service greeted us and helped with our many bags. We used the valet service throughout our stay ($25 per day) and asked for our car many times in those 2 days. They always had the car waiting for us within a few minutes of the call to the desk.
The pool area has a hot tub, pool, and 2 steam rooms (adult only).
There is a very nice restaurant and bar on the premises as well as a spa that offers services in room or in spa.
This hotel has so many amenities that you don't need to leave, but if you choose to, it is in the heart of Grand Rapids. Restaurants, Van Andel Arena, DeVos Performance Hall, DeVos Place, and several museums are all within a few blocks. On a cold or rainy day, you can access most of these locations by using the SkyWalk, which is an indoor walkway that connects the JW Marriott with most of downtown.