We are heading down to Marazion (near Penzance, opposite St. Michael's Mount) in a couple of weeks for a fortnight's family holiday. Unfortunately my eldest son (17 yrs) has broken his wrist and will be in cast for the entire time. He understandably is very p'd off and says he doesn't want to come with us and his younger siblings as he can't do all of the excitingly things-surfing, coasteering, kayaking etc etc. Does anyone have any suggestions what there is to do that might keep him vaguely entertained while we are down there? Staying home isn't an option as we live very rural and he wouldn't be able to get around, do shopping etc and tbf all he'll do at home is sit on his phone! Thanks!