Trebizon for me. Decent sports such as surfing and swimming, not lacrosse!) Set In Cornwall, and also girls were encouraged to have mnay differnet interests and talents and were allowed to go into town and even meet boys!
I would have been dividing my time between Hilary Camberwell Music school, singing or playing and in the sea!
The girls seemed so much nicer there. The girls that did have a hard time were usually treated that way because they had behaved badly (eg Nicola Hodges or Debbie Rickard or that awful Elizabeth Exton) but there seemed less bullying generally there (I think Roberta Jones got teased a bit and Lucy Hubbard, but nothing like as bad as Enid Blyton's characters, who were often teased for being fat or not liking games or being a bit spoiled (as though they can help their parents!)
Sally "Elf" Elphinstone in Trebizon is the chubby girl in the books but she is well liked with a nice personality and no real charcater faults unlike EB's fat charcters (thieving, depressed Alma Pudden, lazy Anna the form head, spoiled, conceited Gwendolyn Mary), and was happy to go swimming and surfing with her friends.
I loved Antonia Forest too, but Kingscote would have been a bit dull compared to Trebizon. Mallory Towers, loved the rock pool and also it being in Cornwall but I suspect I would have been bullied as am not really a team player type or an extrovert and was overweight since aged 12.