nice one, what gun did you have at the time? (only reason i ask is your picture is an etha and i have the same gun )Last year I went for the first time and any advice I could give is take plenty of spare clothes, I didn't take enough and had to live in my playing trousers for three days I'd say 3-4 crates assuming you're not ridiculously trigger happy but that was enough for me.
Take LOADS of snacks, food vendors were a little short in numbers + expensive as I was on a tighter budget, and ofc the expected essentials i.e camping stove