Originally Posted by
joeags
Just remove the 2 children from the reservation. The Marriott system was previously set up only for people, and not being able to inform that there are children. Now they make the distinction, but the system still is reading it as 4 adults. If you were to show up, they would remove the extra adult charge.
This.
The oddity with the website is that when searching for hotels it initially asks you to specify the number of adults and the number of children. Then after you've selected a particular property the rate search panel on the right side of the screen defaults to "Guests/Room" rather than distinguishing adults and children. It simply shows the total number of guests. So your Total Taxes and Fees link gives you the fees assuming all guests are adults because the rate search panel does not differentiate adult and child guests.
On a related note, when searching for rates with multiple adults and children at the Marriott Waikoloa and clicking on the Total Taxes and Fees link it shows the extra adult fees, but it also states "Extra adult charge (children may be exempted)". So they acknowledge that the fees shown may not apply to child guests.