Go for Delhi sight seeing in HoHo bus or can try a metro to go to akshardham where you can spend a whole day and an evening in musical fountain but don't go on Monday as mostly all monuments are close on mondays. If you wanna spend your time in shopping than go to sarojini ngr market you will love that place and it is the best place on shoestring budget with lot of choices of clothing, household items & home decor items. Next day you can go for a sight seeing, as hotels where you stay can arrange a day tour on a bus & its gonna be very reasonable option too. Have a great time in Delhi.