OK, I'll throw in 2¢ for Oahu.
There is a bit of everything. We have beautiful beaches here (not only Waikiki, three of
Hawaii's top ten beaches are on Oahu), waterfalls, trails, look outs, historical sites...lots to see and do. If you want a busy metropolitan with lots of shopping, attractions and entertainment (i.e.
Society of Seven -
Cirque Hawaii -
Magic of Polynesia -
Hawaii Theatre to name a few - we have it. Golf? 5 of Hawaii's top ten courses are
here. Hiking, parasailing, sportfishing, skydiving, hang gliding...lots to offer
You like less action and want that laid back Hawaii you've always heard about? That's our North Shore. You want to see other Polynesian cultures? There's
PCC. There is always something going on - Festivals, Swap Meets, Art on the Fence, parades...You can enjoy it or just as easily avoid it. (check out
www.gohawaii.com)
As for the Diving. It is what you make of it. I was originally certified in the Red Sea - First time I dove here I admit, I was pretty disappointed. Being used to the big elaborate corals and seeing the short stubby stuff that grows here. Soon I came to love our wrecks, which are easy dives that a person with 40 dives can easily do - you don't have to penetrate to enjoy them. A colorful array of tropical fish, invertebrates, sea turtles and more. The reefs are full of life. Just today we had a group of 8 Eagle Rays at the Mahi (Oahu's first artificial reef), Frogfish, eels, leafscorpions...and and and. Later the captain spotted dolphins, we followed them for a bit. Then he saw humpback whales so we went as close as we could. I would say that you can have a great vacation on Oahu too.
this is a bit more than 2¢, but you get the idea
PS: Moved this thread to the Ohana section