What to wear on a school end of year trip? :]?

I'm going to Alton Towers in about a week with the whole of my year & I really have no idea what to wear. I am the fussiest person ever with clothes, and find I rarely look good in anything. I don't like shorts, and hate showing my legs. (Due to the lack of self confidence I have..) I live in the UK, so any websites with idea's would really help. I also have dark chocolate dyed hair, that reaches a little past my shoulders. I'll probably end up wearing it down & naturally curly for the trip :] Thankyou to everyone who answers! :)