Oahu for 5 weeks, what to do

I was wondering why my pants have shrunk...
Haven't tried the Sweet Potato Pie, but enjoying the Sweet Potato/Mochi from Megumi's.

My thanks to everyone for all the great suggestions. I think I visited 90% of them and had a wonderful time, including a half dozen visits to HMS, buying a new Pono tenor, Jake Shimabukuro's concert, and spending time with Kimo Hussey at my daughter's place.
Mahalo!
Rocky