If two weeks still seems like too long to wait for Mario Kart 8, you're in luck. You can play a sampling of it this weekend. GameStop stores are hosting a "Test Drive" weekend, which lets visitors try out the upcoming Wii U game.
According to the announcement, the demo days will be this weekend only, May 17-18, from 12 PM to 4 PM. That's a pretty narrow window, but at least you have options: more than 2,700 GameStop stores will be housing it. Plus, if you pre-order (or have pre-ordered) you can get a double-sided poster. As part of the promotion, GameStop is also holding a Mario Kart Memories contest, letting you share your fond recollections for a chance to win a Wii U bundle and GameStop gift cards.
You can check out the promotional site for a listing of stores in your area that will offer the demo. Mario Kart 8 is due on May 30.