Tipping customs may vary, but a general guideline for tipping at an all-inclusive resort in Antigua is to leave a gratuity of around 10-15% of the total bill for exceptional service. However, it's a good idea to check if a service charge has already been included in the all-inclusive package, as this can vary from resort to resort. Additionally, tipping individual staff members who provide personalized services, such as housekeeping or waitstaff, is also appreciated.