Naturally everybody's spending varies. There are many souvenirs to be bought and a great social scene should you wish to join in! Many of your meals (including lunches on Hostel Plus & Camping trips) are included, so this really just leaves a few meals and your personal spending to budget for.
Throughout the trip your Trip Leader will also inform you of any optional activities which you may wish to participate in, for which you will need to budget extra. You will be able to find a more detailed list and price guidelines in your pre-departure information.