Havelock is a beautiful island and specially Radha Nagar beach. Best in Asia. U can spent hours playing with the water and just watching them.
I stayed in Dolphin resort there and would strongly recommend to stay there. It has access to Vijay Nagar beach. People there are helpful. While planning a holiday to Havelock high temperature should be kept in mind. Also the day ends early there. Everything starts shutting off after sunset. So plan your day accordingly.