I need my Hawaii gurus (again) !

After the usual dithering on my part (and room prices/availablity rising/ dwindling as a consequence :0 ) I now have 4 nights booked in Maui (Kaanapali-Aston Mahana) and 5 in Waikiki (Marriott Spa and Beach Hotel).
Save for the trip to Pearl Harbour what else do we need to try and see ? I'll have a car in Maui and am happy to rent a car in Waikiki for a couple of days if this makes seeing things easier - I would however like a bit of chill time (given we will have a bit of madness in Vegas first
) and any recommendations for restaurants/ bars/ beaches would be great
.
I gather shopping options are much the same as the mainland with several big malls on Oahu ?
Many thanks.
DL
Save for the trip to Pearl Harbour what else do we need to try and see ? I'll have a car in Maui and am happy to rent a car in Waikiki for a couple of days if this makes seeing things easier - I would however like a bit of chill time (given we will have a bit of madness in Vegas first



I gather shopping options are much the same as the mainland with several big malls on Oahu ?
Many thanks.
DL