Date idea in baden württemberg region?

hello,

I'm looking for a date idea for me and my fiancee in the baden württemberg area that is a little different from the usual "restaurant/picnic".

Our favorite restaurant for dates is Abaccos in Heilbronn, so im looking for something unique we can do.

What are your suggestions for something unique, or out of the usual. while preferably not costing an arm and a leg please :)

thank you!