The two timeshares on the Big Island of Hawaii which offer access to the Hilton Waikoloa Village Hotel are
Kings' Land by HGVC and
HGVC Waikoloa
The one that does not include complimentary access is
The Bay Club at Waikoloa
Actually, when you stay at the Bay Club, you do get to use the Waikoloa Beach Resort (WBR) facilities, but not the facilities (pool/spa) at Kings Land or the Hilton Hotel.
At least that's the way it was in May.
UPDATE: After rereading, I noticed the comment about access to the Hotel amenities, not individual facilities/amenities, sorry.