I lived on O'ahu for about 5 yrs! We got to visit the Big Island, Kauai'i & Maui on a few occasions while we were there.
Here's a list to get you started, but please feel free to lmk if you'd like further information at all. We LOVED our time there!
Great Things to See & Do in Hawai’i
O’ahu:
*I’olani Palace
*Pearl Harbor/Arizona & Hickam AFB (bullet holes left from WWII on bldngs)
Waikiki
Swap Meet (Sat, Sun, Wed’s—buy ALL of your souvenirs here!!!!)
Pali Lookout
Drive around island—Blow Hole & scenic lookouts along the way
Polynesian Cultural Center
Lu’au (at Hale Koa or Paradise Cove)
Sea Life Park
Byodo-In/Valley of the Temples
North Shore; Hale’iwa
Dole Plantation
Lani Kai Beach
Hana’uma Bay snorkeling
Sharks Cove snorkeling (NOT during rough water! Best in the summer)
Ala Moana shopping center (over 300 stores!)
Diamond Head
University of Hawai’i
Bishop Museum
Hilo Hattie (main store on Nimitz Hwy)
Birthing Stones in Wahiawa
Aloha Tower
China Town
Honolulu City Lights tour (during Holiday season—can buy tickets @ Ward Warehouse off of Ward Ave)
Waikiki Zoo
Waikiki Aquarium
International Market Place in Waikiki
(Tattoo at Skin Deep in Waikiki)
Queen Emma’s Summer Palace
Free Hula show (nightly, I think) at Duke’s Hula Mound in Waikiki (just past HNL Police Station)
Tantalus Drive & view from top
Atlantis Submarine (on ANY island!)
See surfing on North Shore (during winter months)
Eat at: Dixie Grill, Kua Aina for burgers and/or tuna sandwich (preferably on North Shore, but could also eat @ Ward Shopping Center), Dukes in Waikiki, High Tea at Moana Surfrider hotel, Keo’s and/or Keoni Thai fusion restaurants in Waikiki, Don Ho’s Grill (Aloha Tower), Dim Sum for lunch at Wo Fat’s in Chinatown (oldest Chinese restaurant in China Town), Champa Thai in Pearl Kai shopping center, Pearl City, Hard Rock Café (on any island!), Brew Moon, Ryan’s Grill
Get: a Lava Flow* (drink) and a Mei Tai, try Kahlua pork, poi, eat Poi Mochi, Dave’s Icecream, fresh Maui Pineapple, Leonards Malasada and a white pineapple (if you can find one!), Huli Huli chicken, shave ice, locally-brewed beer
Big Island:
Volcanoes Nat’l Park, lava flow @ night, Thurston Lava Tube, Steam vents, Petroglyphs, Jagger Museum
Punalu’u Black Sand Beach (south side, middle of island, towards Kona)
Place of Refuge (Kona side)
The Coffee Shack for breakfast (in Kona) (incredible view & great food!!!!)
South Point (Green Sand Beach if possible too) (middle of island, toward Kona)
Mauna Kea visitor center for star gazing (be at summit by 6 or so)
Volcano Plane tour w/ Island Hoppers (Cessna planes) (either side, but cheaper on Hilo side)
(Kona: King Kamehameha Beach Hotel is a good place to stay)
Rainbow Falls in the morning; Boiling Pots waterfalls (Hilo side)
Hilton Waikoloa (Kona side)
Lava Rock Café in Volcano town (Hilo side)
Maui:
Snorkeling in Molokini & “Turtle Town” w/ Pacific Whale Foundation
Sunrise bike ride down Hale’akala volcano w/ Mountain Riders
Road to Hana
Iao Needle
Kaua’i:
Hanalei, Wet Cave, Dry Cave, Taro Patch overlook
Kilauea Lighthouse (great view of Bali Hai)
Fern Grotto
Tree Tunnel
Spouting Horn
Waimea Canyon
Hanapepe Town
Na Pali Coast cruise
Wailua Waterfalls