We usually do something in Epcot our first day when its a partial day. Sometimes we tour part of future world and other times we go through World Showcase. My kids are young (7 and 4) so they get bored fairly quickly in World Showcase. We can usually see all of it arriving at 2:00 or so and staying through Illuminations.
Heck...you're at Disney, it doesn't matter what you do...it's all good.