I have 3 12-13 year olds.
DD1, friends here or at one of the other houses a lot, sleepovers, town (weird overpriced frappocino things and the shops), beach, paddleboarding (supervised), walking dogs, picnics, out for lunch. Part of a small, sociable group of kids I like. Organised netball and drama.
DD2, sleepovers, playing at each others houses (making up dance routines, watching dance shows), just starting to go to town with friends, occasional trips to park. Social life is less sorted than DD1 but she has just moved school and best friends both gone elsewhere. Does drama, dance and martial arts.
DS - sports. Cricket and football teams, lots of football training, kickaround at park if no match at the weekend and sometimes after school. Sleepovers. Watching local football team with us and sometimes friends. Friends over to watch football matches or play on iPad. Scouts.
None of my kids are very confident bike riders - suspect it will be more of an issue for DS, lots of his friends like cycling.