Now this is just my opinion...but id call 1900 in Waikiki a trip. I honestly think 3 days is too short in Waikiki. See, if i wanted to check out EVERYTHING a country in Europe has to offer, my intention would be to check out everything because i probably may never go back again.
This, however, is Hawaii. Its still North America yet it feels like another country. Airfares are getting cheaper as well as hotel deals. Im pretty sure you've got a lot of energy for travel down the road so going back to Hawaii years after will be a pleasantry. Hawaii can be an inexpensive trip if planned properly...just like going to Vegas.
Option A sounds great as well...but if you ask me, theres no rush.
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