Hi there. Just a follow up...Tunnels is a BEAUTIFUL dive, ocean conditions permitting. It is usually not available to dive until summer due to north shore swells but the latter part of this week and into next week it is actually very nice and we've been diving it w/great results. So, if conditions remain good, I highly recommend a dive there. The long drive and early start time are worth it. A guided tour is a must here as there are lava tubes to navigate and a ferocious current that can kick in later in the day.
Koloa Landing is probably the dive site the other diver was referring to on the south shore - when conditions are bad, it definitely can be disappointing. But normally - if you love aquatic life, this site is off the hook. So don't dismiss it as a possibility, whether you dive with us or another shop - it is absolutely worth diving. Lots of endemic critters and if you dive with someone who knows the site well, you will have a blast - guaranteed!