You have to ask them based on how the day is going.
Yes this hotel does offer late check out service. However it is based on availability. It can be 11:30,12:30 or 1 PM. If this does not work they have a storage room that your luggage can be locked in. The room is right near the front desk on the first floor. The concierge has the key. Remember doesn't matter where or when you leave your luggage always take any valuables, medications etc with you.
For things to do after leaving luggage for a certain amount of time you can use their bikes or stroller with chairs and umbrella.
Also take a walk along not only Ocean Ave but behind the hotel since there are some interesting stores and restaurants to see.
Yes. If you request in advance!!! They also have early check in. They will keep your bags in a locked room until your room is ready.
Yes they let us check out an hour late - we requested permission in advance that morning.
I was able to get a late checkout both times I stayed there. As with any hotel though it's based on availability.
Get an answer from Marriott Vacation Club Pulse, South Beach staff and past guests.