... I could spend a day at the Hilton Waikoloa also - they have the Dolphin Programs, Stand-up Paddleboards or Kayaks in the lagoon there and all the beach activities on A-Bay nearby. You don't have to be a guest. Resort Activities | Hilton Waikoloa Village | Kohala Coast...
The artwork all through the Hilton is worth the visit just on it's own.
Plus A-Bay beach has the LavaLava Club. $3 Longboards at Happy Hour and some very nice mixed drinks - "Gilligan's Girl".