Welcome back, Samantha!
I adore both Disney's Beach Club Resort and
Disney's Polynesian Village Resort, you have great taste in Walt Disney World Resort Hotels. However, there are some differences between the two resorts, namely the design of the bathroom area. While Disney's Beach Club Resort does offer a vanity area with two double sinks that is separate from the shower/commode, the rooms at Disney's Polynesian Village Resort do not offer this design. This tropical resort does not have a separate vanity area, but two double sinks with a shower and commode in the same space. If you select the highlighted link above, you can scroll through photos of the rooms interior to help give you an idea of the setup.
I do have another suggestion, you could always book the new studio rooms available at Disney's Polynesian Village Resort. These rooms are part of the newest edition to this resort and are part of the Disney Vacation Club (you do not need to be a member to book these luxurious rooms). Not only are they slightly less expensive than the Polynesian's standard hotel rooms, but they also offer a split-bath design, which is like having a one and half bath. The pack 'n' play could be placed in the half bath area (sink and shower) and you would still have access to a whole additional bathroom while he is asleep! The website has not yet been updated to include
photos of these new rooms, but if you google it, you can easily find a floor plan of this studio room.
I hope this helps, Samantha! Please let us know if you should have any additional questions. We are here to help!
Faith D.