Great place to spend a day! You can purchase a day pass or just pay for one activity at a time. I've done the zip line, the hiking, the flat water kayak, and the sit-on-my-ass-and-people-watch. One day I'll splurge and get a day pass. Rafting looks like fun. The Subaru Riverjam is really cool, free live music on Thursday nights.
They actually have an exceptional restaurant at the USNWC. Huge burgers, yummy Cuban sandwich, great side items (like watermelon). The beer list is impressive, too (but avoid the Nodajito, it tastes like Pine Sol).
I've never had bad customer service here. A little slow at times, but always super friendly. I highly recommend this place, regardless of how much money you have to spend.