The Eyewitness tour guide has some nice self directed walks. Walk a lot and stop along the way for a hot drink and people watch. You can spend days just doing that. You know, test cafe chairs type thing, this one's too soft, this one's too hard, etc.
. There have been times when we never got out of our own neighborhood.
The Jacquemart Andre Museum is a lovely little place with a very good restaurant.
Personally I like buses since I get to see everything and you are in an area where the transportation is great.
Have a great time. I've yet to go in the winter and would love to.
Bobette