I have to remember that the turn off of 352 South for the Tyler Arboretum is after the turn for an entrance to Ridley Creek State Park, because I turned too soon and ended up in the park. I think the arboretum and the park back up onto each other at some point, but I don't know where. I'd done that before though, so I knew to turn around in a parking lot and go back out to 352.
Anyway, I made it there. The Tyler Arboretum plant sale is on May 5th. I'll see if I make it to that, but I'll certainly try.