I would advice doing both! All the mtv stuff is concerts with HUGE name acts! So, there might be some artists you want to see, and some you dont! So, I would advice to pick and choose which ones you want. The boardwalk is going to be THE place to be during the day on the beach, that where mtv's stage is going to be set up, so even if you aren't going into the show, you will still be around a LOT of people partying on the beach!