In a medium sized bowl (I used my glass 1 cup Pyrex), combine pineapple juice, lime juice, vinegar, oil, garlic, salt and pepper. Mix until all ingredients are well combined. Reserve 1/4 cup of the marinade in a small container.

Place chicken in a zip top plastic bag. Pour remaining marinade over the chicken and close the top. Massage the bag so that the chicken is well coated in the marinade. Place chicken and reserved marinade int he refrigerator. Allow chicken to marinate overnight, or more, flipping the bag over periodically so that chicken is well marinated.

When ready to grill, remove chicken from marinade and discard the marinade that was in the bag with the chicken. Grill the chicken until it is cooked through, about 25 minutes. Every 6 minutes or so, baste the chicken with the reserved marinade (which never touched the raw chicken).

Serve hot