Camping in Sri Lanka can be the best experience you can have while being close to nature. Amidst the scenic jungle location you have a chance to go for rainforest camping which will allow you to get deeply absorbed in the sound of the water being closer to the fall.
One can couple the camping expedition with other water activities such as water rafting, bird watching and trekking to waterfalls amongst others. You can have the same concept in a jungle safari too which is an equally thrilling experience. And you can hear the sound of the animals clearly since it is located right in heart of the jungle.