According to the hotel website it's

"Must have one adult 21 years or older in each room. Children under 15yrs stay free if sharing room with parents. Children 12-15 years of age are charged a $4.50 per night housekeeping gratuity. Person 16 years and older are charged as adults. Third or fourth adult in room are charged $40 per night plus taxes and service charges per night. Energy surcharge: $ 9.95 per adult per night. Housekeeping gratuities: $4.50 per adult per night. These are additional charges that are not included in the estimated total and must be paid directly at the hotel. Five rooms or more is considered a group. For groups please contact 1-800-417-6738 Ext 24."

so if one goes with teenagers and you all pack into the same room the add-on charges could be quite significant.