Thats round the corner from where I stay... the Windermere Marina Village (
http://www.wmv.co.uk/ ) You get a 2 bed house with views over the lake... and there is a bistro type place called The Spinnaker... some really good grub in there. Another nice hotel is the The Lakeside (
http://www.lakesidehotel.co.uk/ ) Its a bit expensive compared to the others, but with the right room, you get a good view of the lake and right outside is the steamboat that will take you up the lake to Ambleside or Bowness. I prefer to hire my own boat for the day... its cheap as chips, and providing you get the petrol engine version, you can enjoy some of the more peaceful spots of the lake.
Got an electric boat once... spent an hour or so adrift and in the path of the ferry... they're not what you'd call reliable
Might be a bit of a long way to bring a camper, but there is an excellent lake side camp at Fallbarrow... no tents allowed unfortunately, but I reckon they'll let me on there with the TD when its complete.
If you're in Bowness in the future CD, if you wander across from the centre and walk down Rayrigg Road for about a mile, there is a place called Millerground on the left hand side... small dirt path that leads to a really quiet spot next to the Lake. I used to sit there for hours... its one of my favourite places on earth.
Bizarrely Billesley Manor is a few miles away from a great campsite just outside of Kennilworth... I have a friend down there who I used to work with... lovely part of the country also.
And pint wise

Northern pubs aren't quite the same as in other parts of the country... but there's some nice ones round this way. Mind you, I'll hopefully have our garden sorted with a little barby area over the next month or so, and I'm working on installing a beer fridge out in my shed.
Cheers, Dewi