So we're leaving for our honeymoon next week Sunday (yay!).  We're spending a week in Orlando, and four days in Miami.  
We're in Orlando for WDW and Universal Studios, so we're good on that front - but we're going to Miami to lay on the beach and relax.  Any suggestions for low-key activities or restaurants?  We're staying right on Lummus Park in Miami Beach.  We're good with walking all over the place, and love museums, etc.  We will NOT have a car.