Colmar is one of the towns right by the winemaking areas of Alsace, described as "the jewel of l'Asace", and when it was too cold or windy for cycling, we went to spend that day there and see what was to be seen. It's clearly oriented around the tourist trade, and even on a cold day out of season, it was quite busy with sightseers.
On the downside, they have those wretched parking pay stations that expect you to pay using your mobile phone. Have you tried using those? Nightmare. We eventually found the bit that takes real money.
The old buildings in the centre are well-maintained, and the waterways that thread past make an attractive backdrop. The Little Venice sector is especially pretty.
We had lunch in Ye Olde Touriste Trappe, of a dish that was touted as a local speciality - rosti. That is, a dish of grated potato placed in a skillet and roasted in an oven, and with a topping of various ingredients of your choice. We were not especially impressed, but I think thet dish itself holds promise. If the potatoes had been better cooked and the sauce better integrated into them, it would have been OK.