Need suggestions of good romantic places near shobabazar, dumdum or girish park

So my girlfriend and I are planning a quick little day out (2-3 hour meetup). Nothing too fancy; can you suggest any good places that are near a metro station and not far from Dakhineswar? We will meet up at the Dakhineswar metro station and will be traveling by metro. Help find some good, not too crowded parks or heritage buildings where we can spend our time relaxing.

I heard Marble Palace is a good choice; what do you suggest?