This page will help you to all the in game items in Subway Surfers. These include Mystery Boxes, Power-Ups, or Character Tokens to name a few.

You can get those items in the game:

Super Sneakers You can jump higher and longer
Jetpack Fly high above the rails and collect hundreds of coins.
2x Multiplier Doubles your multiplier for a short time.
Coin Magnet All coins will float to the player, so you can collect coins from all three rails at once.