I try to visit the palace whenever I am in Cooch Behar. My parents belong from here. The beauty of the place is worth mentioning.
The gardens are genuinely well kept. The park is huge and there are also good food options here. Toto vehicles will easily take you to the palace at very cheap rates.
The palace houses interesting museum with excellent collections. But with each passing year, you will see more and more artifacts vanishing from the palace. Due to low security I am sure the artifacts are getting removed easily. So compared to the outside, the inside is losing its charm every year. You can enjoy your evenings here with your family with a very cheap ticket. Have a pleasant stay!