I have made a iternary for my friends who want to visit Oahu. Hope you find this useful for you too.
Avoid peck times (eg summer or 3 days weekends or major holidays - Thanksgiving, Christmas) as hotel rates will be sky high.
Regarding food selling on Oahu, it can range from the Dollar item ($1 plus tax) on most McDonald to $6 or 7 dollar plate lunch on local restuarant. Drinks are additional charge.
As for hotels wise, below links are some more popular hotels chain with decent rate & cleanliness.
Inter-island airlines web-sites are also listed below for your research. Check them often as they do offer rate like $29 one way plus tax & fee per person. This is a GREAT deal.
If you are planing to come after July, there is a possibllity of catching Superferry (schedule to begin service in July of 2007) from Oahu to varies islands. You can drive your car on board to go to another island. However, you got to check with the rental car company on their policy on this.
Day 1 - Mon ~ Waikiki
Arrive this day, check into hotel and check out Waikiki beaches or areas (like the zoo, aquarimum, Kapiolani park) in the morning.
Then, go to Ala Moana Shopping Center (just outskirt of Waikiki) for lunch.
Opposite of Ala Moana Shopping Center is Ala Moana Beach Park.
Magic Island, part of Ala Moana Beach Park, is an enclosed area, great & safer for younger kids.
Be sure to take a great picture of Diamond Head view from the park.
Keep the first day around your hotel as you might be tired to go farther.
Check out Todai resturants for dinner. They have great seafood (mostly Japanese style) buffet.
Day 2 - Tue
Drive around the island. Visit North Shore, Dole Plantation (see the world largest maze), more beaches at Sunset Beach, Sandy beach, Bellow Beach. Ko O lina. Make this a drive day and visit as many places as you can.
Find a beach you like and come back another day.
Day 3 - Wed ~ Aloha Stadium/Pearl Harbor/Might Mo Battleship/Pearlridge Shopping Center
Go to Aloha Stadium Swap Meat/Flea market in the morning (like 7a.m is the best time). This Swap Meat is only available on Wed, Sat & Sun morning. Large selections of Hawaii gifts to take home for family & friends. Be sure to negiotiate when buying large quality.
A small fee required to enter the stadium (50 cent per head currently).
Spent about 1-2 hours in this place.
Then, process to Pearl Harbor/Arizona Memorial, which locate across from Aloha Stadium.
Free admission to watch the World War II documentary (about 20 min) on Pearl Harbor attack and a free boat ride to the Memorial after documentary., a donation will be helpful to the center. Surroundings are plates of history.
The documentary & boat ride is about 1 hours. However, on Wed/Sat/Sun, it is very crowded. You might have to wait a few hours before you can into the movie.
If you have a ticket for a late show, go & visit Might Mo Battleship (next door to Arizona Memorial) or do it after Pearl Harbor.
Fee required. A trolley will take you to the battle ship. Please join the guide tour as it is very informative. Went with a few friends and the history the guide told was very helpful.
Spent about 3-4 hours on the ship.
In the evening, proceed to Pearlridge Shopping Center. It is about 5 min drive from Pearl Harbor. Turn left at the traffic light at Pearl Harbor/Arizona Memorial exit. Right turn at Pali Momi road and into the Shopping Center. You can do great shopping there or just have dinner there before going back to hotels.
Day 4 - Thu
Take a hike to Diamond Head. Great city view. But fee required to go in. At the end of the paved path, there are a lots of stairs to climb.
Spent about 1-2 hours.
[If you want free hike and great view, proceed to the East for Makapuu. Also paved hike path, but mostly ocean view, not city view. Another free city view will be at Punchbowl National Cemetery (see Friday).]
For lunch, stop at Koko Marina. There is a Zippy Resturant which is a local delight.
After Diamond Head, go to Hamauma Bay. Closed on Tuesday. Great safe snorkeling place.
Spent whole afternoon.
Head back to Waikiki for dinner. There is a place called Palama Market, outskirt of Waikiki, is famous for great Korean food. Prices are very reasonable.
Day 5 - Fri
Visit Punchbowl National Cemetery in the morning. Varies wars history can be read on the wall displays. Also, take a short walk to open area. Great city view.
Free entrance. Please be respectful to the dead bury there.
Spent less than 1 hours.
Drive about 10 min down to Iolani Palace. This is the only Hawaiian Palace here. Take pictures outside the palace only. Join the Grand Tour for interesting Hawaiian history. You can watch a film too.
Fee required for touring inside the palace.
Spent about 1 - 1 ½ hour if joining tour.
Across from the palace is the famous King Kamehameha Status.
Next to the left of the palace is the Downtown Business District. Walk down Hotel Street (this street only allow Bus to drive thru, no cars allow) towards Chinatown.
Chinatown only 2-3 blocks away. Visit Little Village resturant for delicious Chinese food. Or go to Chinese Culture Plaza for good dim sum.
If you like art, visit Honolulu Art Museum which is outskirt of Downtown, towards Waikiki. Fee required.
Head down to Kakaoko Park for a great sun set view. This was once a dump site. But now a nice park area.
Find a L&L Plate Lunch for dinner. Local favorite eat out. There is one in Wal-Mart (near Ala Moana Shopping Center).
Then, head to Tantatus Mountain for a great city night view. Driving required to get up there. Free.
Day 6 - Sat
If you find a beach worth second visit (from Day 2), spend another day at this beach. If not, visit Waikele Shopping Outlet for some last minutes gifts. There are also places for Pali Lookout,
Note, Swap Meat at Aloha Stadium available in the morning.
Day 7 - Sun
If you have a longer stay at Hawaii, I would suggest that you visit other islands.
My favorite recommendation is Big Island (also known as Volcano Island or the island of Hawaii).
Big Island is worth at least one day trip to the Volcano. You can do a early morning flight & jump on the latest flight back to Oahu. Fly to Hilo if you want to visit Volcano Park.
Otherwise, spend another 3 day there is great.
(Available on most islands)
Local inter-island airlines: