In the McDonalds of Hawaii, there are many things that aren't on menu for other places.
Depending on the season, McDonalds comes out with different types of pies.
For this season...

Taro pie!
This pie is soo delicious that there are times that it is sold out.
I usually cannot handle eating Hawaiian sweets, but this Taro pie is extremely good.
Another product that I am into right now, is the Mocha Frappuccino. This one as well is not too sweet. (←Some McD does not sell so be careful.. The McD in Kalakaua, and clost to the beach does not have it.. But there is on the Kuhio McD☆)
Please come on to Hawaii and try it out yourself. 