Will be visiting end of May - based in Colmar. We love interesting little towns and would love to find one near Colmar that we could visit. No more than 2 hours, preferably. Gengenbach has been recommended but we can't really find enough to do there.
Thanks for any helpful advice.

Check out Freiburg, Germany... I wouldn't call it "little" but the old town is nice.

https://www.tripadvisor.com/Attracti...rttemberg.html

Train to Traben-Trarbach, Berkastel-Keus, or if you could put up with a city, Trier

What might make a big difference in the answer is knowing whether you are traveling by public transport or will have a car.

I like the towns that bilboburgler has suggested very much, but if you feel Gengenbach has too little to offer, then you might feel that way about those.

Trier definitely has more to offer, as does Freiburg. What are your interests?

Staufen is a cute little town not far from Colmar.

Gengenbach has the Narrenmuseum in a cool tower...medieval Lenten/spring procession costumes.
Walk up to the chapel above town through the vineyards. Try some local wines and Pfannkuchen-a crispy flat pizza. If you find out what day is market day on the square, that was cool. See medieval street Engelgasse.
Get back on the road to nearby German Open Air Museum in Gutach. I stayed for 8 days in Gengenbach taking daytrips!

Vogtsbauernhof is the Open-Air museum in Gutach (home of the traditional Black Forest Women's hat with red balls!) This is a lovely half-day wandering through many traditional types of old regional German home architectures. Some days there are programs/events.
The Narrenmuseum in Gengenbach is in the 7 storey circular Niggelturm..great views from the top.
Of course, you've already checked out www.Gengenbach.info, clicking top left for English.