You can check out Champa Gali as there are number of cafes over here which is perfect for a solo date!
Champa gali n garden of five senses
Head to Qila Rai Pithora for some me time amidst history!
You should visit Deer Park hauz khas and spent quality time alone. Enjoy the best atmosphere.
Select City walk mall in saket is a really gorgeous place to visit during evenings for good pictures and you can shop there too if you want.