Is there an art gallery nearby.
I'm arriving there Monday morning.
What kind of Art?
Heidelberg is a university city - one of the main travelling points for Americans in Germany. Frankfurt and Stuttgart ain't far away either.
Look at the travel guide of the City of Heidelberg
https://www.heidelberg.de/hd,Len/300652.html
Body Worlds (plastinated human bodies - a similar museum is in London and Berlin)
https://bodyworlds.com/exhibition/heidelberg/
Kurpfälzisches Museum
https://www.museum-heidelberg.de/pb/,Len/896835.html
There is a couple of exhibitions as part of the university, too.
Plenty of cultural activities in Heidelberg mate
That - and for the ones that arrive early and are more interested in some other kind of culture - the Cannstadter Wasen opens the weekend before in Stuttgart. It is the World's second biggest beer festival.
https://www.cannstatter-volksfest.de/en/landing-page/
There is even more in the area - Speyer is just about 20 kilometres away from Sinsheim- there is a sea world.
I guess you can find something for everybody in that area - and you will find beer or wine places, too. Especially the wine as it is the time for the fresh wine of the year.
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As said - the village where Sinsheim or next to it Hoffenheim - is, is small. Not the typical place for a football club. But the area around is pretty populated - there is some bigger Cities around and Stuttgart and Frankfurt aren't that far either. Hopp, the founder of SAP was born there and got his home club into the Bundesliga - what the football purists in Germany do not like. You will see that they do not attract masses of away fans. Hopp today is a philanthrophist who with his foundation invested money in all kind of activities in the area - social, medical, research, youth sports etc. There is not just the football club but a Handball and an Ice-Hockey-Club, too, in which he invested a lot of money.