My favors would be as follows:
-I would ask Twilight if she would assist me in astrophysics and engage in some nerdy banter.
-Then I would ask Fluttershy if she could help me out with choosing the right kind of pet for myself.
-Afterwards, I'd strut over to Applejack's farm and ask her if she would kindly bake me a delicious apple pie for consumption
-Since I'm there already, I'd ask Big Mac if he would like to bro-out for a day, maybe get in touch with Braeburn, Caramel, and Thunderlane and make it an all Stallion pow-wow.
-If I ran into Rainbow Dash, my favor would be to ask her to challenge me in an Iron Pony competition!
-I would then go to Rarity's boutique and politely ask as a favor if she could help me update my wardrobe.
-Finally, I would ask Pinkie Pie if she would throw a huge party, inviting all of Ponyville, in my honor!
edit: I can't just ask 1, I would need to ask all 6! Haha.