Aloha!
Koloa Landing is a FANTASTIC dive that is relatively easy in and out as shore dives go. Right now the dive is loaded with critters including Harlequin Shrimp, Leaf Scorpions, Octopus, Horned Helmet Shells, Turtles, Lionfish, and an unusually large amount of Frogfish. I have divers come back year after year to do this dive and personally would put the critters at the Landing up against any boat dive.
June is summer swell time so my suggestion would be to dive with swell in the flat to 2 ft range. 3-4ft starts to impact vis' with the wave action in the cove. I think it's a slam dunk as a great experience and if your "Hubby" doesn't like the work of the in and out portion of shore diving most DM's are more than happy to carry gear in and out.
Check swell with your shop and I think they'll guide you for a sure thing dive treat.
Best of island wishes and feel free to send me any specific questions you may have
A