Colmar and around has lots of great things. Here are a few to start (I assume the Isenheimer Altar/Museum Unterlinden is on your list already) :
http://www.epicurien-colmar.com is a nice wine bar with a fun list and tasty food.
A few minutes away is the covered market.
https://www.marche-couvert-colmar.fr
One of the best affineurs anywhere (go to the store, but they are also in the market)
http://www.fromagerie-st-nicolas.fr
Super nice wine store
http://www.lasommeliere.fr (owned by the Tempe family, but many other great producers from Alsace and France)
A must is a trip to Christine Ferber to buy the amazing jams, but also superbe pastries, Terrines and Foie Gras (the glass jars are extremely good and keep well).
https://www.christineferber.com
5 minutes from Ferber by foot is Albert Boxler. Better to call or email ahead and make an appointment.
ALBERT BOXLER, 78 rue des Trois-Epis 68230 NIEDERMORSCHWIHR, Tél : 03 89 27 11 32
domaine@albertboxler.fr
The other branch of the family has a nice Wistub in the village. Good for a snack or rustic meal.
https://www.caveaumorakopf.fr
Close by in Kaysersberg you have obviously Domaine Weinbach and also Paul Blanck. The latter has regular store hours and makes an easy impromptu visit.
http://www.blanck.com
Just a few minutes into the mountains from Kaysersberg is
http://www.lecellierdesmontagnes.fr
They sell all kinds ofd items from local organic farms. So if you are keen on herbal teas, jams, honey etc it is a great place when in the neighborhood.
http://www.tavernealsacienne-familleguggenbuhl.com has a strong wine list.
http://armesfrance.fr was the big Rival of the Haeberlins in my youth. Now less ambitious but I am planning to go back myself. They still cook some of the classics like the dad's famous sole and noodles.
And I might repeat myself, but going 40 mins east into Germany to the Kaiserstuhl is very worthwhile.
https://www.weingut-holger-koch.de is one of my absolutely favorite wineries. And there are several other very good within 2o minutes.
https://www.franz-keller.de/en/ also make really good wines, but even more important have three restaurants. The Schwarze Adler has an epic wine list at very fair prices and you can eat classics like truffled chicken in salt (if you want it poached in a pigs bladder you need to order ahead).
I stop here, but there is much more...