Need playground recommendations

Hi, we’re in from out of town and I want to make our just turned 3 year old’s birthday party in a playground tomorrow but I need restrooms, plenty of picnic tables and options if it gets too crowded such as a second playground, splash pad or something else on the grounds. To me Hermann Park fits the bill but my husband, who’s from here is sketched out and it’s a long walk from the lot for my in-laws. We’re staying in Braes Heights/by the medical center. Thanks!