Apart from Playstation, of course 
The holidays are long after GCSEs and before sixth form. Dh has no possibility of taking leave so we are not going on holiday.
Ds cannot do a job (if there were any round here) as he is not 16 until the end of August. Likewise volunteering - his work experience placement was keen to have him back but is not allowed to do so until he is 16.
So... any suggestions? Ds is supremely unsporty so any kind of sports camp would be his idea of Room 101.