mn is odd.
I do think some parents and kids who drive everywhere are very unaware of how much independance many 11 year olds have as soon as they travel to secondary.
my kids cycled to the station, got on a train, then walked up the hill to school. On the way home they often went into town, went to shops, cafes, even (shock horror) ordering things themselves and sitting and eating it.
Occasionally, as I said before, they would miss their train and then go (alone) to a local cafe and have a hot chocolate while waiting the 1 hour to the next train.
Of course an 11 year old is capable of all this. If you 11 isn't then as I parent I would be working to help them to become more independant.
Our local library is in our street, and on the way home from primary school. My 3 kids spent hours in there. They would come home and go bakc up, they would go up there on a Saturday morning. The library was fine from age 8 as long as they behaved. I think my middle dc was an unofficial library assistant on Saturday mornings, as she spent a couple of hours there and helped reshelve books etc.
I regularly checked with library that they were ok, and the response was - it is lovely to see kids who love books.
If you seriously think that your dc cannot go into a cafe on their own until age 15, please, start to teach them to be more independant.