Marlins fans!

I'm an Angels fan flying into Miami at the end of this month to visit the new stadium and figured you would be the best people to ask about getting to the stadium. I will be staying in South Beach and was wondering if cab is the best way to get to the park for a 4pm Saturday game (6/30 vs Philly) or if there are more cost effective/quicker ways to do it. First time visiting the city so I know nothing about traffic, public transit etc.

Also, any suggestions for stuff to check out inside the park?

Thanks!