Well, I called and got my answer, after a fashion.

The "Marriott" in question is Renaissance Aruba Resort & Casino. Children are free, but can only stay in the Ocean suites. The "Marina" rooms, which are much cheaper, are for adults only.

We are visiting Aruba as part of a cruise. If the room was reasonable enough I was going to rent a room so we could visit the private island and use the hotel facilities. Since I still don't have my six stays on the Megabonus, I figure I get a $75 rebate on each stay.

The cost for the Marina room is $172 all in. After calculating the value of the Megabonus and points I figure the room would only cost us about $90, but sadly we aren't eligible because of the kids. The cost for the Ocean Suites that will allow the kids is $296. I figure the first is doable. The second is a bit too high, so no Aruba Marriott for us.

I understand they sometimes sell day passes to the private island for $75 for adults and $45 for children, and that it includes lunch and sports equipment. Still probably too high. Sigh....