We've watched Illuminations from in front of just about every country in World Showcase - and all are great views! Depending on how crowded Epcot is, the FP+ viewing area is sometimes more crowded than the promenade around the lagoon. Our current favorite spot to watch is along the fence just on the Japan side of the America area. As you look out at the lagoon, the American Gardens Theatre will be on your right - it's also the spot that the Earth globe 'drives' out from. Unless you are there at Christmas, Easter, or July 4, you can generally get there about 30 minutes before the show and find a decent seat. In those crowded times of year, best to arrive an hour early.