Remaining payments are usually made in cash on arrival to your activities. The easiest way to organise this is to bring some envelopes, collect everyoneβs remaining payments at the start of the holiday keep the envelopes in your safe, write the activity in each one and simply hand over on checkin to each activity for a swift start to things.
Some activities may require payment cleared prior to arrival. You travel planner will help check and update you on whatβs required for your specific itinerary