2010 yatra

We are planning on going to Amarnath, Vaishno Devi and more. I have visited some Travel and tourism sites on line and have some idea. But, if there is someone who had hands-on experience, please write and we will be much grateful. The three of us are over 65, but have energy to travel. I am seriously considering the Helicopter tour. What are the dos and don'ts? Any advice is appreciated.