DD is 13 and I have left her alone on the odd days (say 2 days out of a week's half term) for about a year now.
For the longer holidays she goes to my mum's house in Devon. I work very long hours, and also we live about 15 miles from the village where her school is (and therefore where most of her friends live ) so she would be a bit isolated. So, she has great fun at my mum's (mum lives near a beach) but she does miss spending time with her friends here, and also I miss her like crazy (and spend most of my weekends in the summer holidays traipsing down the M5). Thankfully I always take the last 2 weeks of August off to spend with her, but the first two weeks of the holidays are very long indeed.
What does everyone else do for childcare (teencare?) in the summer holidays?