Go to Moscow
There is no reason not to go to Moscow, the only one that it can be a bit hard to get into. The city is beautiful and there is plenty to see and do. The nightlife is amazing and you will feast your eyes on all the beautiful women, sorry girls the Russian guys aren't that attractive. There are plenty of tourists though. Good for culture, shopping and partying.
Insider Tip:Take the metro as much as you can. Buy multi trip passes as the more you take the cheaper it gets, while its already cheap as can be. A general trip across the network costs $0.50