The summer and the monsoon seasons are from June and July and from the end of October until December respectively. During this time the area receives an incredible amount of rain, which would make going outside and travelling quite difficult. The incredible amount of rain that is received will cool down the temperatures, but it will make going outside of the hotel room a practical impossibility.
The best time to visit this area is from December until March, which is the winter season. The weather during this time is sunny and dry, even if it is a bit chilly. Ideally, you could also visit during April or May, but the temperatures rise along with the humidity. This is one of the best times to visit if you want to be able to enjoy the water. Some of the resorts have pools, which can be availed during the summer months.