Date plan in Budget

I'm planning to spend the whole day with my girlfriend in Nagpur, from around 9 AM to 6 PM. I need a date plan that’s simple, sweet, and not too heavy on the pocket.

Would prefer places that are quiet or less crowded where we can chill and talk, maybe a few spots with good ambience and food (but not too expensive). Also want to add a few happening or fun places to keep the day exciting.

Basically looking for a full-day plan that’s affordable, peaceful, and fun.