Please take some time out for visiting Dudhwa National Park. It is an amazing experience. Lucknow is great for a visit and the food is really mouth watering. Varanasi will give you an experience like no other. Mathura and Vrindavan will give you a spiritual tour. But if you are looking for something offbeat, and history interests you, then you can visit Jhansi, and some nearby places of MP(Datia, Sonagiri, Orchha)