• Skydive on Oahu. Only really interesting thing I did on Oahu besides Pearl Harbor, which is good if you are into history, WW2, etc. Yeah you can skydive anywhere but the view is incredible.
  
• Big island: I had fun just driving around, the landscape was really interesting.
  
• Hilo farmers market
  
• Mauna Kea - amazing drive at or around sunset. Stay to watch the stars. If you live in a light polluted city or have never seen the milky way you are really missing out. This is one of the top dark sky spots on earth. When we were there the uni astronomy people were there with really nice telescopes pointing out interesting things. Drive to the top is worth it although not a ton to do at the very top as opposed to the visitor center level. FWIW I drove up in a Ford Fusion rental, I was not told not to drive up there, it's really no problem in good weather, just watch out for altitude sickness (you may be driving from sea level to 14000 feet in a few hours - I felt like I was getting drunk at the top and had to go back down to visitors level ~12000 feet).
  
• Volcanoes park even if you don't see lava has some interesting stuff, the caldera is neat. Apparently there are boat/helo tours that have a better shot of seeing lava.
  
• Toured an organic farm on Kona side that grew coffee and all kinds of stuff including some strange and delicious fruits I had never heard of.
  
• On Kauai Waimea canyon is amazing and has lots of hiking.
  
• On Kauai there is also a somewhat famous hike around Hanalei that goes to a nice beach and waterfall and is a 1 or 2 day outing, depending. Kauai seemed more laid back even by HI standards, up to you whether it's worth an additional island hop.
  

Infinotize fucked around with this message at 15:34 on Aug 22, 2015