We were just introduced to Zac Efron  and Michelle Rodriguez's friendship this week, and we're already loving it. The duo is currently vacationing in Italy, and on Tuesday, they hit the open water instead of dancing on tables and doing headstands . Michelle posed for a mini photo shoot with a friend on a boat, wearing one of her signature black bikinis  and doing backflips into the ocean in Porto Cervo, Sardinia, before she and Zac left to walk along the boardwalk once they docked. Unfortunately, Zac wasn't shirtless or dancing  this time, but he still looked superhot. Keep reading to see their guide to a perfect Summer vacation, as told by their day in the sun.