You're welcome!
I'm into gardening too, not as much as reefing, but I really enjoy gardens and garden tours. I really enjoyed checking out all the many Orchids growing "wild" (outside is wild to me haha) in the botanical gardens. Kauai is a perfect destination for a garden lover.
Let me know if you go there, I will give you contact info for the snorkel tour, and give you the low down on the different areas to visit. The island is small enough you can do a pretty good job exploring it by the seat of your pants too.
PLUS, you can go to Snorkel Bob's and berate him for trying to shut down the aquarium fish collectors.