Aloha,
"No rain - No rainbows".... You didnt pick the wrong month at all. None of us had any way of expecting what has happened. This is just Mother Nature being... well, Mother Nature. Last March-April we had amazing conditions and crazy Humpback Whale encounters! I can say that in 7 years here I havent seen anything quite like this. I dive for a local dive shop and it is shocking to all of us. However... today we had afternoon sun! And no rain yet tonight. I watched about a dozen Humpback Whales playing in the shallow waters off Poipu beach (Sheraton Resort - South side) with a friend for about 45 minutes just this evening. We have our fingers crossed for all visitors on their way to Kauai. Ok, that doesn't help much huh? You're getting mixed opinions which makes it tough I know. But it doesnt take long to clear up here and return to "Hawaiian diving conditions." That is the truth. No soul on this island can say what is ahead. That's a tough reality that we are dealing with. You are still about 2 weeks out so things can really change. Dont hesitate to call your dive shop - or email them (the one you will dive with here). We'll guide you the very best that we can. Kauai is a magical place that you will love - and we want the diving to be a HUGE part of that. I am here on island now - so please ignore statements of "no roads" or issues with water supply. People are trying to be kind no doubt - but just aren't totally informed. There are isolated road closures here at the moment but they are not expected to be an issue for tourists come April certainly. Water just isnt an issue either. The primary boat/scuba tours are Fathom Five, SeaSports, and Bubbles Below. While I work for Fathom Five - I encourage you to call any of the dive family here on island and we will help make your dive vacation wonderful - to the best of our abilities of course. If you don't get the answers you need of enough of the info you desire... just repost and I will personally help in any possible way I can.
Mahalo