I was staying at Hyatt Regency Waikiki for nearly a week where I was using their 24 hour business centre for about 2-3 days working to EST time (which means starting work at 3am!) then the rest of the time was heading out.
Went swimming also, but no photos taken.
It was too bad that there was not a lot of exploring. Mainly due to lack of preparation.
Waikiki was very touristic and busy. Would be interesting to go out to the other islands.