Visit Lodhi Garden, Lotus Temple, Birds Hospital at Lal Mandir, Akshardham temple
Visit akshardham temple..
Attend their musical fountain show and boating rides.. it'll be worthwhile.
Or you can go to smaaash or WOW or adventure island for a playful evening.
you can visit humayun tomb and hauz khas
Go for cycling at CP by renting some cycles from there itself.
Visit India Gate at night 🌃
You can visit lotus temple and India gate . There will be no charges.
visit delhi's old heritage