Something a bit educational: make a camping journal, as if preparing research for say a TV programme (to make it more glamourous). Write in it about what they did, how they felt , interview the campsite staff/friendly neighbours about what they enjoy/don't like, opinions on the area. Collect pics or other items to paste in or if e-media is their thing, take photos and write it up electronically. If the latter, they could take little videos (with permission etc if necessary) and make their own voiceovers.
You never know what they might discover - like a talent for film making!
Ditto - making a film? Use their creativity to come up with a storyline to story board/write/direct etc.
If too tecchie, go back to pens and paper and colouring in books - for the adults too