I read the terms as saying that while you can purchase five certificates, you can't use them for five days in a row. That said, I'd bet that'd be reasonably easy to circumvent.
Limit five per person, up to five additional as gifts • Limit one voucher per reservation; vouchers cannot be combined to extend stay • Reservations required and subject to availability • Not valid on existing reservations • Merchant cancellation/re-scheduling policy of 72 hours applies; voucher subject to forfeiture • Blackout dates are December 13-17 and February 11 - 14, 2012 • The deal is valid only for date range purchased and may not be exchanged or redeemed for any other dates • All deal components must be redeemed during one visit • PROMOTIONAL VALUE VALID ONLY FOR THE DATE RANGE SELECTED AT TIME OF PURCHASE • Other conditions apply • PAID VALUE EXPIRES ON November 21, 2016 • PROMOTIONAL VALUE EXPIRES ON February 29, 2012