Or you could take the bus from your last monorail pub to DS, and continue to crawl around DS. Buses run to DS from the resorts until at least midnight, and from DS to the resorts until 2am.
I do believe both Splitsville and the Boathouse are open until 2am. Or if you want to finish off with dessert, Ghirardelli is open until 11:30pm weeknights, midnight weekends.