In the morning, after having your breakfast in the hotel, you can check out from your hotel and then can proceed towards Mathura. It only takes one hour from Bharatpur to Mathura by road. There are many famous temples in Mathura like Dwarkadheesh Temple, Banke Bihari temple and many more where devotees of Shri Krishna come to visit from all over the world. There are also places like Sri Krishna Janam Bhumi where Shri Krishna was born and Vishram Ghat which is Shri Krishna's resting place after his win over Kansa.
After visiting Mathura you can go to Gokul where you can visit temples like Raman Reti, Chinta Haran Temple, Brahmand Ghat and Chaurasi Khamba.
These are very beautiful and are very significant temples so devotees make sure to visit all these temples.
After visiting all these templates you can check in to your hotel and can stay overnight in the hotel and can rest.