Dash made it about 10 feet into the indoor playground. It took him 30 minutes to get that far. I did my best to just be patient and let him ease into it at his own pace, especially since parents aren't allowed in the park. Maybe he'll do better next time.
Update: Once Rosie joined him (she wanted to ride the carousel first), they both disappeared into the upper levels of the playspace. I was worried when I didn't see either of them for several minutes. Then, I saw Dash's smiling face! Wait, no, that's a grimace of fear. Dash got stuck on a platform, abandoned by Rosie and couldn't figured out how to get down. We sent his play-pal, Matthew, up to get him, but he was very much done for the day.