The night before, chill the canned pineapple juice and limes in your cooler.
At camp, squeeze the limes and strain out any seeds.
In a wide-mouth water bottle or cocktail shaker, combine the pineapple juice, lime juice, honey or agave, and salt.
Screw the lid on tightly. Shake vigorously for 20 seconds to dissolve the sweetener and blend flavors.
Fill each cup halfway with ice cubes. Pour the drink over the ice, dividing evenly.
Garnish with a lime wedge or a fresh pineapple spear if you have one. Serve immediately.