Just my family's 2cents... we did 2 islands this past December being away for 10 nights... son 14 DD 10 and stayed 4 nights at HWV, 1 night in Volcano Village and then 5 nights in Kauai. This Xmas we're staying a full week in Kauai and then 5 nights in Oahu (couldn't get return FF tickets for whole family from Kauai). Though the HWV was nice (stayed on points) found that for older kids the pool is just "ok" and there's no beach on property. Getting in/out took forever. There are other lodging offerings that we feel are much better choices (such as Hapuna Prince).
JMHO though