Our guide was great but the canyon was disappointing. It was completely fogged in so we did not see anything. You can't do anything about the weather.
The tours were excellent! We had very friendly and informative guides which made the experience both fun and educational. Both the canyon and the fern grotto were beautiful. The canyon, of course was spectacular. Having the Hawaiian wedding song and entertainment on the river cruise was fun. The fact that we went back to the ship to eat was fine. It gave us a change to rest for a few minutes and regroup for the second half. All in all a very good double tour.
We really enjoyed the Waimea Canyon. It was a good tour. The River tour was just so-so. Pretty touristy.