Working out / slimming down

Me and my husband are leaving for a week to go camping in Michigan with about 3 other couples In the very beginning of June. So I want to be semi decent looking in a bikini lol We will be hitting the beaches up and what not . Does anyone have any workout advice ,tricks or tips that will help in some slimming down and weight loss. I have a treadmill, some weights , an a weighted vest also a stomach belt that makes you sweat extra around your belly area. Any advice would be appreciated !!