I found Naha itself to be a very ugly city. The market was my favourite "sight" there. Outside of Naha, things are prettier in parts. My next trip will be to one of the less populated islands.

DAY 1
Visit the Tamaudun mausoleum and reconstruction of Shuri Castle
Visit the market which is just off Kokusai-Dori in central Naha
Eat pigs face and "umi-budou" (sea grapes) seaweed.
Find a place to hear some live okinawan folk music or pop music.

DAY 2
Hire a car and do a tour of the Peace Park and the ruins of "gusuku" castles which are dotted around the island.
Eat Okinawa soba.

DAY 3
Go to a beach.
Get drunk on awamori and make rude signs at some US marines.
Start running.

DAY 4
Visit one of the smaller islands for a more laid-back okinawan experience.
Eat goya champuru.