It really depends on what you're looking to do. If you're taking the Skyliner, you'll be entering at the International Gateway right into the World Showcase. So if you plan to enjoy the 'future' side of the park, you need to go left, go past Great Britain and Canada, and head over. That will get you to attractions like Test Track, Soarin', Spaceship Earth, etc. That could take many hours. If you enter the IG and go right, you're heading towards the rest of the countries in World Showcase. There are attractions in WS you might enjoy, too, like Remy, Frozen, American Adventure, etc. Maybe go 'left' one day and 'right' the other, as you state above! Also, you'll be there during Food & Wine, so I'd highly recommend looking at menus before you go, and enjoy some food/drink in the World Showcase while you're there. It's a great place to graze and enjoy non-sit down meals - part of the fun of EPCOT. And if it interests you, definitely stay one of the nights to watch Harmonious. Plan to watch around France, Gr Britain, or Canada - when the show's over, head to the exit. There will be many folks heading out that way, but there will be many more behind you!