Well, lately, I always seem to save outside the Pokemon center, But, I don't stand right in front of the door, I always stand one pace forward from that (if that made sense). Because then, how will others get in to the PC? I know the other NPCs don't actually go in (or come back out of ) them, but it just doesn't feel right blocking the door like that!
Come to think of it, I tend to save in one of the biggest cities in the region (or else the city closest to the Daycare), right in front of the Pokecenter, facing forward. For 5th gen., I tend to save in Nimbasa a lot. Occasionally Castelia.
Yeah, I like the big cities. I'd like to move to a big city in the middle of all the action in real-life, so I guess I'm living it vicariously through Pokemon. LOL! XD
I love saving on one of the gates leading up to the Elite Four; that gate where you step on it and you start flying with the leaves and everything. It just looks so cool when you bend down on midair and start saving.
But otherwise, I like to save whatever natural feature is near me, not in the middle of somewhere as then I start to get confused about what I was doing there in the first place and get lost