Take a bus n rush to the waterparks of dehradun.. such as
1-FUN VALLEY
2-CRYSTAL WORLD
3-LACHIWALA
4-ROBBERS CAVE
5- KEMPTY FALL
6- RAFTING IN RISHIKESH
You can go to mathura , agra , alwar is best site for historical things. and these places are quiet near from delhi.
i hope my answer helped you to resolve your problem