It depends on where you are going.
There are (2) walking paths, the main East side (near Congress Park) and the West side (behind Turf Club, and much closer to Grandstand)
Google Maps says 12 minutes from the closest Grandstand to Splitsville (near Cirque on the West side)
But Rainforest Cafe on the east side, is more direct walking through Congress Park with 20 minutes. (About a mile)
If you get a far Grandstand building, it could add another 5 minutes.
There’s also a boat that goes from bear Turf Club to the West Side dock.