How do I estimate unusual exercise?

jen331975

How do I estimate activities that do't fit with any category obviously? I am a teacher and will be going on school camp from tomorrow to Friday. As well as having no control over what I'm eating, only how much, some of the activities I will be doing with the children are easy to log, others less so!
I will be doing a muddy assault course (about 30/40 mins at jogging pace but with many obstacles) and a woodland scramble, where I will be running up a river, climbing over and under trees and swinging across the river (about 1 hour 30mins)! I know it will be a very active few days, but I don't want to delude myself that I can eat more than usual without worrying (this level of activity and being outdoors all day does make me feel hungrier!), if I'm over estimating my activity....

Thanks
Jen