They'll all be fine and have an amazing time am sure!!
My daughter and her mate loved it last year when they were 14, wandering around on their own during the day and going out for tea on their own, with a couple of nights spent in Eastenders with older friends - no they didn't stay out til 4am haha It was nerve racking for us waiting for them at the bar in the aparts, but we'd decided to let them have a bit more freedom, provided they stayed together and didn't drink - and to their credit, they stuck to the agreement!
Thing with
Icmeler is that they can do more than they can at home - visiting bars, etc and people treat them with respect and like adults. It was a great experience for them to be able to spread their wings without fear of trouble etc Also, there are cameras in Icmeler so if/when they walked home on their own at night, the deal was that they had to walk a route where cameras are up
I reckon they'll have a better time than you hahaha