Hawaiiiiiiiiiii!!! 🌴🌞🌊 Need recommendations!!!

Okay, so it's not until December but my husband booked us a trip to Hawaii as a wedding anniversary trip. We've never been and don't know where to go.
  1. We're not resort people and don't want to spend a ton of time at the beach. (I am a pale Scot, after all.) Think lazing around reading and gawking at great beauty. And the occasional lazy hike. (Apparently, lazy is key.)
  2. We're thinking Kaua'i or Maui. Thoughts?