Last month (December) we did two nights at Universal staying at Portofino. Then six nights at WDW......two at AKL, two at Contemporary, and two at Poly. Disney makes it super super easy to do split stays! Just go to the park of your choice the morning of the switch and take your bags to Bell Services of the resort you just stayed at. They will move them for you to the new resort. If you didn't want to go to a park right away and wanted to swim at the new resort then pack a small bag with your suit and whatever you think you might need in the first half of your day at the new resort. We learned that the hard way. You wont see your bags for several hours while they transfer them. ONce you are in your new room just call Bell Services and they will arrange to bring up your bags! We had
MNSSHP on the first day of our stay at Poly and before we left for MK our bags still hadn't arrived from Poly but Bell Services is open round the clock and at 12:30 am they brought our bags to our room! I love split stays if only for the opportunity to check out other resorts!