As a family of 5, you'll definitely be in the Alligator Bayou area. You probably already knew that

but mentioning it just in case and for others who may be wondering. POR is smaller than CBR. If you need to have a ground floor room in the buildings that do not have elevators, definitely request one ahead of time, and if that request is not honored, ask again at check in. They should work with you if at all possible to make that happen. POR is absolutely gorgeous! The Alligator Bayou area can be a little tricky to navigate as it is a wooded area with various pathways. If you get lost (personal experiences here, lol) just walk to the outer edge of the resort, pathway loop, and follow the parking lot around to get to the front. It will take longer, but it is a sure fire way to get from Alligator Bayou to the front of the resort.
There are multiple bus stops located around the resort, so no one building is particularly far from one. There are preferred buildings in the Alligator Bayou section that are very close to the main buildings. All Alligator Bayou rooms are 5th sleepers.