1) We go to Hawaii every-other-year, alternating with London.
2) We now rotate among the islands.
3) For a first visit with teens, I recommend Maui.
4) As for islands comments . . .
. . . Maui - party island, with the widest diversity of activities.
. . . Oahu - like Miami Beach, and very commercialized
. . . Kauai - veg-out island with lush scenery ("garden island")
. . . Molokai - quite primitive
. . . Lanai - only two resorts and somewhat barren
. . . Hawaii ("Big Island) - sightseeing, but is spread-out
5) Activities . . .
. . . Maui - party town (Lahaina), good beaches, golf, winery,
. . . Oahu - "ok" beaches, Pearl Harbor, winery, golf
. . . Kauai - GREAT beaches, golf, Grand Canyon, lush vegetation
. . . Molokai - little to do but relax
. . . Lanai - little to do but relax, golf, scuba/snorkel
. . . Hawaii - cattle ranch, nice long drives, volcano