Take following points in mind before taking policy -
1. What is the maximum length of any one trip?
2. Is there allowence for Skiing/Extreme Activities at any point?
3. Baggage Claim Limits?
4. Medical Calim Limits?
5. Do you have any medical problems that need covering?
6. If you buy a couple or family policy, can they travel independently?

All the best for your travel.