Yes It Is Definitely A Good Place To Go But Make sure That Ur Resort Must not Near The Highway It Might Disturb Ur Holidays So preferd Resort On Mountain Or Outside The City
I have visited Coorg in Mid January this year. It is good place for 2-3 days trip with bunch of friends. I think it will be more hotter in May. You can stay at Zostel Coorg for different experience. Location, food, and staff are pretty good there.