Things to do:
take a drive along Wrynose and Hardknott pass, take a trip on the Ratty train, grab some food in a local pub
Drive
Rent a small electric boat at Bowness bay and have a little ride around he lake
take a cruise on one of the ferry boats down to Lakeside, have a wander around the aquarium, take the steam train to Haverthwaite
Drive over the Kirkstone pass and visit Glenridding , climb Helvellyn, drink beer in a local afterwards or keep on going until you get to Aira Force , take a stroll
Have a wander around some of the villages close by- Ambleside, Grasmere - buy some gingerbread or other ‘ginger’ related stuff
Buy local chocolates - there’s a few shops - Friars (ambleside & keswick) and Huttons (bowness on Windermere) I always buy chocs when I visit
Have a day in Keswick - eat cow pie - fish and chips from the Keswickian - loads of places to drive or walk around there -Newlands pass to Buttermere or down the Borrowdale Valley then go up the Honnister pass at Seatoller - visit the skate mine or do the Via Ferrara, the drive down to Buttermere - keep going past Buttermere village and past Crummock water , drive back towards Keswick along the Whinlatter pass , take a walk around the forest or do ‘Go Ape’(also a Go Ape near Windermere)
Can’t help with food much as I tend to go to Jintana Thai restaurant each time I’m there but there’s loads of decent places , I did once have Afternoon Tea outside at the Laura Ashley hotel overlooking the lake , was pretty good but if there’s a wedding on they probably won’t be open to the public