The Williams Water Wall is a very cool water feature. We've never been there during the day. At night it is really cool. The lights and the flowing water are mesmerizing. This is a popular place for couples to visit (romantic). But families visit too. I would definitely visit there at night to get the full effect.
If you are near the Galleria, it is definitely worth it to make a stop at the Water Wall. It is a great photo opportunity! Recently. Brad Paisley filmed part of his music video for "Water" at the Water Wall! The Water Wall tends to be crowded on the weekends, so if you can stop by during off peak hours, you will get the best opportunities for pictures. There is a small park near the Water Wall and it would be a great place for a picnic. Parking can be kind of tricky, as it is close to the Galleria, but it shouldn't be a problem. This attraction is FREE, which are the best kind! :)
Located near the transco tower and galleria, this huge water wall is awe inspiring for adults and kids. Next to a huge manicured lawn great for picnics or frisbees.