In reply to Lantys Tarn:
I find that with outdoors jobs it hard to know how to dress especially as a girl.
Anyway.
Look keen, dont be afraid to be honest if you have no experience, better doing that than looking like an idiot later on. Willing to have a go at anything. Enjoy working with all age groups, or whatever the centre aims itself at.
Read up about the centre, whether its government funded or privately funded etc, ask a few questions such as possible training, courses.
Trainee jobs can be so different so make sure that you are getting a good one, with qualifications and training provided, some try to get away with just everything on site and pass outs which will not really help you in the long term.