Be aware that you understand what is included in the tour cost and what is excluded. Many tours that I have been on have presented their itineraries to seem like they were chock full of excursions. They were, but almost every one required additional payment during the tour. This was manageable but annoying. Also be aware of what meals are included and which you will need to pay extra for. Budgeting for your out-of-pocket expenses on your tour is very important because you could be caught short with insufficient funds.