The highlights of my trip include Waikiki Beach, driving around the island, Dole Plantation, hiking to Manoa Falls, the Paradise Cove Luau, snorkelling at Hanauma Bay, and climbing up Diamond Head.
Quick Tips:
Do get the Hawaii Entertainment Coupon book for great discounts and coupons. The savings you get will easily cover the cost of the book. I used Priceline.com for accommodation reservations and ended up paying a night, excluding taxes and fees, for a three-star hotel in Waikiki two shorts blocks from the beach. Go to the website below to read my review of the hotel, and check out the bulletin board on how to get such a great rate for the hotel using Priceline.
http://p070.ezboard.com/fpricelineandexpediabiddingfrm167.showMessageRange?topicID=16.topic&start=15&stop=15
Best Way To Get Around:
A car is not necessary if you're planning on sticking only to Waikiki or relying on public transportation. However, a car and parking is available inexpensively and will give you greater convenience while saving plenty of travel time.