A same-day Taj tour is a long day: a drive of seven to eight hours with a visit squeezed in the middle. One night in Agra changes this. You arrive at a civilised hour, see Agra Fort and the sunset over the Taj from Mehtab Bagh, then enter the Taj Mahal at sunrise, when it is cool, quiet and softly lit.
On the way back to Delhi we stop at Fatehpur Sikri. If you have more time, see our Sunrise Taj Mahal Tour from Delhi, or add Jaipur with a Golden Triangle tour.