No mosquitoes!
camping
Tourists are not allowed to stay overnight at the Valley; they have to return back to Mukkali by evening.So camping in the jungle is difficult. Mukkali is also densely forested; you may ask permission from the Forest deparment office if you wish to camp in Mukkali. No gurantees.
lodging
Forest department has a guest house/dormitory at Mukkali. Rooms have to be booked in advance.Rooms are decent , without expecting anything more than what can be expected in remote outskirts. If your focus is nature, then it shouldn't matter.Ensure you are prepared for power cuts, which are very frequent. The forest guest house is at a good , peaceful place, with the bhavani river just flowing behind the guest house.