We have a thread already discussing access to HNL lounges.
This is dedicated to amenities within.
I visited several last week and the contrast between them is vast.
This is the Premier Club (Same offerings in KOA and HNL):
It's literally self serve soft drinks, coffee, tea and pre-packaged snack mix. They provide wifi and it's an air conditioned room. Access in HNL is via an agent at a desk. I did see the same cleaning staff in both HNL lounges.
Plumeria Lounge is HA's premium offering. It seems to be an upgrade in many ways from even Alaska lounges. It has restrooms in the back as well.
Outside the Plumeria Lounge in HNL (same level as the wiki wiki shuttle)
The Gumbo was not bad. Tomato was a pass.

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Miso Pork and rice. I enjoyed perhaps a bit too much. 
[img alt="Lilikoi Cheesecake bites and Chocolate Chip cookies. Both tasty!
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Lilikoi Cheesecake bites and Chocolate Chip cookies. Both tasty!
Pancake toppings bar (Yes, there is a pancake machine!)
Salad bar. Great looking dressings too.
Poke bar (looked interesting)