Had a one day stay at United Grasslands 21 with family. May thru Oct is the off-season for Kaziranga National Park. You'd be lucky to get yourself a jeep ride once it starts raining regularly. The stay at the hotel was good. We chose an Executive room (lowest in the range) - Molina. Bed was comfortable. Bath was clean and nice. No food options available around. The restaurant food (I think it was called Turmeric) was not something to rave about. Stick to your standard dishes and you may not be disappointed, except for the price may be.
Wish I had a longer stay to enjoy the Gym and Pool, etc.