Zipline? ATV? Manta Rays? Fluming da ditch?
 

Trying to keep 3 older kids - (16, 19 and 22) entertained. We are planning to do the helicopter tour on the Big Island. 5 days there, and 5 on Maui. Any recommendations on Zipline tours or other exciting things? I have the HawaiiActivity card and the Entertainment book. I'm looking for deals on the squeals!

Something we WISH we had done on Maui (and will when we go back) is the horseback ride down the Sliding Sands trail on Haleakala. My husband did the bike tour and really enjoyed it.

PS - I LOVE the "deals on the squeals". How funny!

Try this:
http://www.hawaiiforestandtrail.com/index.html

I think I went on a couple of hiking tours through them. There's also a tour company that will take you up to Mauna Kea at twilight for star gazing (VERY COOL).

I've only heard negative things about Fluming da Ditch so ..... not sure if you'd want to do that.

Another Big Island place with activities is Kahua Ranch:
http://www.kahuaranch.com/profile.html
I understand (through the owner's daughter) that the evening on the ranch is quite good.

My son's and DH and I did the ATV trip on Kauai when the boys were 17 & 21 and it was quite fun even though it was too many squeals for me! Don't know anything about any of the ATV trips on Big Island or Maui...