You can book at clubmac.dtouch.es with your room number (you need to have checked in already).
You can book from 7 days in advance to the day before until 5pm. Please note that half of the spaces are reserved to be booked at the InfoPoint outside Marte the day before the activities from 5.30pm until 7pm.
Also please note that most activities will require you to turn up at the InfoPoint for the material necessary to do the activity. If you don't collect the material the booking will be cancelled.