Our concierge at the Pahio at Shearwater recommended the "Best of Kauai" one day tour of Kauai, which included the land, boat, and a short helicopter view of the spectacular Napali coast. It was informative and beautiful.
Nick, our grandson, enjoyed the Hanalai Bay beach just below the beautiful Princeville Resort Hotel. He also really liked the pools at the Pahio complex.
For another thrill, we did the Kauai ATV Tour, and their motto "Do something dirty", was great and true, requiring a soaking down with a water hose to get that red mud off, and out of all our openings, it seemed, after racing thru a huge mud puddle. Very good trip, with waterfall, a swim, and jump off the water falls.
The Luau at Coconut Grove was excellent.
Quick Tips:
Try to plan some time for snorkeling or scuba. We took a free scuba course in the pool, but didn't have time to do the scuba tour.
Be cautious on the beaches, but look for those hidden beaches.
Best Way To Get Around:
You'll need a rental car to get the most enjoyment. Rental rates aren't that expensive.