We visited the Botanical Gardens on the Saturday before Easter. There was an Easter Egg hunt for the kids, so it was a little crowded when we first arrived. The kids festivities ended around noon, and it was quiet and peaceful the remainder of the time we were there.
The garden is a good size, but not so large that is can't be walked and enjoyed in a few hours. I was with one family member who was on oxygen, and one who had bad knees, and while they were tired at the end, it wasn't that taxing.
Everything was in bloom for spring, and it was absolutely beautiful. The dogwoods were wonderful, and all the spring flowers were in full bloom.