I have 4 DDs - my eldest is 16 and the youngest is 10. I spend my life driving around!
We're not in town, but we are on a bus route. If they want to meet friends in town, I generally expect them to get the bus (eldest 3 only, DD4 is a bit young still IMO) whereas if its an arranged activity - ie ballet, gymnastics, cheer, after school clubs etc then I will drive them. Although this is largely because getting to their ballet or gym or cheer would be 2 buses and a fair walk.
We do seem to have their friends round a lot, but I prefer that in a way as I can keep an eye on them - if they were out I wouldn't necessarily know where they were, or with whom.
In terms of what they do with their friends - if they're here it's a lot of giggling, changing their clothes multiple times, playing on their phones (I'm sure sometimes they text each other when they're sitting in the same room?!), listening to music, watching tv or YouTube videos, eating me out of house and home...
If they go out it tends to be shopping, cinema, or just wandering.