G'Day Fintail,
Lived on Oahu for 7 years, not sure who told you that Sandy's was a good shore dive, but it must have been a boogie boarder!
I agree with onfloat, don't do Lanai or Blowhole without a guide (they are about the closest dive spots to Sandy Beach). There's a wicked current some days known as the Molokai Express. :no
North Shore (Sharks Cove etc) will probably be out at that time of year due to surf conditions. Your best bet for shore diving is probably going to be west side, Electric Beach, Pray for Sex, etc. etc. or south shore (Magic Island...Yuck
). Although most worthwhile South Shore dives are from a boat (IMHO), as are the wreck dives on the
West Side.
FYI average price on Oahu for
Boat dives is $100 for a 2-tank charter. Tanks and Weights included, but not gear. Hotel Pick-Up/Drop Off and Lunch are normally included.
Oahu has some great wrecks, if you get the chance and can fit it in with your budget, I'd definitely check them out. Favorite one is the
Mahi Shipwreck, normally followed by
Makaha Caverns which is rich with lava tubes, swim-throughs and Hawaiian Green Sea Turtles.
Have a great time in Hawaii. Cheers and Safe Diving,
R