I am not sure what other resorts for teens you would be refering to? Honestly curious to know what other resorts have that.
When we were at Aulani there were lots of teen and full family activities that teens might be interested in pretty much every day that are listed on the Daily Iwa (the daily schedule that is put out and can be picked up at the front desk each morning).
Its really just kind of dependent on what your teens are into. Its certainly not as much as what is offered for kids at Aunties Beach House.
Every day we would pick up the Daily Ewa and I would try and talk my teen boys into trying some of the teen specific activities that were listed. There were usually around 4-5 listed daily specifically for teens. DS (16) did wind up going to the Teen Animation Studio activity one night from 8:30-9:30 and enjoyed it. There were around 12 other teens that participated.
We really wanted to do the Ukelele class but the timing never worked for us.
Just to throw out some of the Teen (or 'OPIO as they were called in the Daily Iwa) activity options that appeared on our various Daily Iwa's ....
They had a:
-teen athletic boot camp on certain days at 11am
-a teen Sunset Mele on the beach on one day at 5:45
-frozen yogurt socials
-beach games
-Teen Aloha House Party
-Teen Island Beach Challenge
-Teen Activity Game Night
just to name a few.
The most memorable thing that our boys just loved was the surf lessons we scheduled with Hawaiian Fire.... that was an absolute blast for our whole family!
http://www.hawaiianfire.com/Irons/
Hope that helps!