OK, here's the criteria, I'm wondering if such a place exists......

- Within a reasonable flight from Chicago, travelling with a 2/3-month old baby (who of course is a perfect angel and won't annoy any other pax while flying). We will buy her a seat.
- Relaxing
- On or near water is a plus
- In a city/town with lots of interesting places within walking distance
- Great for a three or four day visit
- Baby will be happy (so probably not going to Mexico on this trip). I am posting here because I assume that other travel-lovers will understand our goal of getting the baby used to travelling early/young ... others maybe aren't so tolerant as this community is...

Some places I've considered are:
- Newport RI
- Marin County CA
- Miami Beach
- Quebec City

I am not looking for a major sightseeing destination (baby wouldn't like that) but we also don't want to just sit in a hotel room and watch waves for three days (so we eliminated places like Cape Cod, where we'd have to do a lot of driving).

Suggestions?