My apologies, but Search is down and I need feedback quickly (yes, I'll try Google in the meantime)

It looks like I need to figure out how to split up a 7 night Hawaii stay between Waikoloa on the Big Island and any of the 3 properties on Oahu - JW, Renaissance Ilikai Waikiki, and the Waikiki Beach Marriott. The Ren and Waikiki can be had for the standard award, the JW only has $30/1-cert per night upgrades.

From what I can find, after we hit the Volcano park on the Big Island, there's not a lot more, so a 2 night stay is probably enough there.

I know I want to stay at the JW, as it's the cream of the crop, but do I spend all 5 days there (I know it's out of the way and we want to get to some of the sights), or do I spend 2(3) at JW and 3(2) at one of the others? If so, which one?

There will be 2 adults, a 6-yr old and an 18-month toddler, so moving won't be that easy.

Rental car may also be a factor - 2-3 days at the JW without a car to relax/swim/snorkle, then move downtown and get a car to see the sights, maybe?

I'm already doing 5 days on Maui and the logistics are already hard enough so don't introduce Kauai into the mix again (hint - don't bother ever trying to get a *A award to Hawaii)

Any thought, experiences, recommendations?