Planning a trip to Rocky Mountain NP this May.

The two of us are experienced hikers and outdoorsmen, we plan on hitting multiple trails and camping at various locations within an 8 or 9 day period.

Any recommendations as far as trails go? We'd prefer destinations that are less populated by other hikers.

Also, can you get away with venturing off the trail and camping where you want? From what I understand off-trail camping isn't allowed, but I feel like people do it all the time and it would be easy to do without getting in trouble.

Any other advice would be really appreciated.