We go to the lakes very regularly, our 12 and 14 year old love it. Sometimes we push them a bit far on walks and they might moan but mostly they’re great.
everyone loves Keswick best but I actually prefer Windermere! Bowness can be a bit crazy but Windermere is a bit more civilised and you can easily walk down to Bowness.
you can get the ferry or hire a a sailboat from Bowness.
grizedale is great for Go Ape or just a walk around. There’s a good playground there and the cafe is quite nice.
Brockhole is good and close to Windermere - you can get a bus if you don’t want to drive, it stops v near.
greythwaite estate is great for activities and paddle boarding. We did a lesson with them and it was brilliant, also did the 4x4 off road driving there and they let the kids have a go.
chocolate making in Hawkshead.
you will need to drive around though in the lakes as it’s all quite spread out.
keswick is still a great area and loads to do as already mentioned. Buttermere is a lovely walk if you don’t want to go up a mountain, it’s a circular walk around the lake and is stunning. Lots of sheep and highland cows pottering around. There’s an amazing cake shop in the village there. Can combine that with Honister.
honestly there is so much to do. We have been doing several times every year and we still do something different every time.
if you’re going in the holidays I would pre book activities and restaurants.