First, a shout out to Yelper Daniel R. for recommending this on the talk boards! I got to town a couple hours before my boyfriend and had some time to kill. This was a great place to do it. Though I didn't get totally zenned out, I did have a nice time chilling in the shade and feeding the fish.
They're charging $5 now (with a minimum of $10 on a card--so I picked up a tee). Fish food is 50 cents and worth it.
The park is smaller than I expected. I grew up in DFW and the fantastic Japanese Gardens in Fort Worth spoiled me a bit. I also hated that the office buildings eclipsed the views in some places. But the fish were super-hungry and fun to watch and the waterfalls were pretty. It's small though--I saw one woman lap it a couple of times; maybe not a bad idea. All in all, it's a nice spot for reflection and a good first stopping off place for some tranquility in the city.