I would go to Haleiwa and eat at the burger place there, i forget the name.

You could go to the Polynesian cultural center(EAST SIDE OF ISLAND) and see the shows there, but they're very hokey and put on by the BYU campus next door(so that east side of the island is dry, no alcohol).

You could also go the Pineapple plantation in the center, walk the pineapple maze and eat pineapple treats.

Or go to North Shore and watch the incredible waves.
There are some great snorkeling spots in Honolulu and on the Southeast and Southwest shores, but the waves can be kind of choppy in the winter, so you might not get a good day to go.

Have fun!
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King's Village is a fun place to look for trinkets and barter with the locals. http://www.kings-village.com/

Besides all the touristy places (if it's your first/second time on Oahu, then you HAVE to hit all the touristy places), I would recommend hitting some of the famous and fabulous beaches: Waimanalo and Makupu'u on the windward (northern) side of the island.

My family is from the Big Island, but Oahu is nice as well...
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I would suggest you hire Guy Kawasaki or check out Alltop. It is the most advertised thing anyway.
Source(s):
http://hawaii.alltop.com/

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Hit up Keneke's in Waimanalo for shave ice or a plate lunch if you go that direction. I thought Kailua beach was gorgeous (Just a bit north of Waimanalo.) Also drive up to the Pali lookout.
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1st, the Hilton Hawaiian Village is SPECTACULAR!
When you check in, be as nice as possible and tell them it is your first visit. Ask if they have a room in the Rainbow Tower facing Diamond Head. The worst they can tell you is no, and I have had the good fortune of staying there every time just by asking.

If you have funding to support fine dining, please eat at Bali by the Sea. The macadamia encrusted opakapaka there is the best dish I have ever had. (I am a foodie.) Order an appetizer and an entree, and they bring you the most amazing dessert as an expression of aloha. Reservations are generally required.

If you are there on a Friday, go to the King's Jubilee & Fireworks
http://www.hiltonhawaiianvillage.com/activities/entertainment.asp#kingsjubilee

If you are on Oahu on a Wednesday, Saturday, or Sunday check out the Swap Meet at Aloha Stadium.
http://www.alohastadiumswapmeet.net/

When will you be there? The probowl is coming up, and many players stay at the Hilton Hawaiian Village.
Source(s):
5-6 trips in the past few years where I stayed at the Hilton Hawaiian Village

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your best bet is to rent a car and do a grand tour of the island heading toward Diamond Head finishing by dinner on the north shore for a spectacular sunset, romantic dinner and the highest waves on the island.
If this is your first visit, you must visit Pearl Harbor for historic purposes.
A detailed list of activities on Oahu is avaliable at www.pleasantactivities.com
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Bellows Beach near Kaneohe. It's on USAF land but open to the public on weekends.

Video @ http://www.tripways.com/destination/united-states/hawaii/oahu

Lunch at Pat's at Punaluu....a liitle further north from Bellows....very close to the Polynesian Cultural Center
Source(s):
http://www.tripways.com/destination/united-states/hawaii/oahu

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You need to go to the Polynesian Cultural Center...it's day long but definitely well worth it. You can see what the center offers here http://www.polynesia.com/about-the-pcc.html Definitely one of Hawaii's best attractions bar none.
Source(s):
http://www.polynesia.com

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