For a place like this everything will be great, because scenery is fabulous. Botanic garden is pretty interesting they have large collection of mountain flora and fauna. Best time to visit is June because then everything blooming. Ticket for garden is included if you go to Pointe Helbronner.
This is a great location as part of the Skyway, but the time to visit would be early summer when the plants are blooming. I went in August and there were no flowers. Since it is part of the skyway up to Point Helbronner it is worth getting off to admire the scenery.