Scarlett Johansson wore a bikini under her tank top yesterday when she stepped out to get tacos for lunch at Ono Char Burger in Hawaii. She's off on a week-long getaway with boyfriend Nate Naylor and some of their friends. They've been spotted hanging out on the beach, fishing, and having drinks on a chartered boat. Scarlett's buddies also kept the good times going at a birthday bash a few nights ago. She and Nate cozied up for hugs and kisses, and he struck a funny pose when taking a group picture. Scarlett's off in the tropics enjoying a break after hanging out in NYC, where she cohosted an Obama fundraiser with Vogue's Anna Wintour last Tuesday. Once she's back on the mainland, Scarlett will begin switching gears into promotional mode ahead of The Avengers landing in theaters this Summer.