I've started using the American Express
Fine Hotels & Resorts program to book at the Portofino Bay Hotel, but it is only available to American Express Platinum and Centurion Card holders, but it gives a 4:00 PM guaranteed check out as well as other benefits (a free lunch, free breakfast every morning, room upgrade, and we were welcomed personally by the manager on duty when we checked in last time we used it), when we checked in they specifically asked if we wanted to use our late check-out. The downside is that you have to pay AMEX's rate, which is more expensive than the APH rate, for our two-night trip in December the rate is $220, which is $92 more total for two nights than the APH rate we could have otherwise gotten, but since we'll actually use the late check out it's worth it for us.