Spend it with Pinkie Pie and her wonderful endeavors, then hit up a night club and see Vinyl Scratch play. If I had some extra time, I'd get dressed up to go see Octavia at a Symphony.
if I had to chose one, i'd chose Twilight Sparkle
Go meet all of the background characters, see if they really act the way we think they should. After which, go meet some bucking Princesses!
I'd spend my time working with Derpy on the Muffin and delivery buisness :3
My tumblr: http://darkshinethepony.tumblr.com/
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I would talk to Twilight and see if there was a spell to come back or stay forever.
"The bitterest truth is better than the sweetest lie."
I wanna meet all of them!
I'd go visit Rarity first (of course) and have her whip up some new fancy party clothes for me. Then we'd go to the town square where Pinkie Pie would be throwing the biggest party ever so I could hang out with all of them! I wouldn't want to leave any of them out if it was just one day. There would be many group hugs had that day.
Dragonbait's Pony Tumblr ~ "Time is an illusion, lunchtime doubly so." - Ford PrefectPoeticBait - (Still canon)
I would go on a picnic with all the Mane 6 and then I'd go to Rarity's boutique and buy one of her fabulous dresses from her.
Go meet all the ponies at sugar cube corner and eat cake, then go on some pony adventure.
For the humor impaired, all sarcasm will now be written in purple
I would go visit Rarity, she is simply wonderful darling