Most states cant say anything about you flying over areas out of season. Its during season that many have laws regarding this very thing. I may be mistaken, and taking this from only hearing it on several shows, but Alaska wont let you hunt the same day you fly? Idaho wont let you scout by air during season, especially relaying information to the ground via air.
I plan on doing several "crosscountry" flights this summer. Might coincidentally plan them over some select areas that I know offer GREAT flying views!!

All of coarse pre season mind you.
Flying doors off in a helicopter also allows for some awesome photo ops if you have a good photographer along or a second pilot that can hold the controls while taking pics!!
One thing to pay attention to is how close you are over animal refuges. Rules of flight are more restrictive over them. Also find out who owns or operates the land and call them to coordinate your flight time with them.(ie forest service, BLM, Dept of Indian Affairs, private land owners, etc.) If their is anything going on in that area they will let you know ahead of time to avoid any issues. Just let them know your wanting to do some low level recon and photo flights of the area. Your pilot your flying with will know how to set up anything like that as well.
Edited to add information below
Here is an article about the rules and concerns of the Colorado DOW. It will probably answer any questions you may have about air scouting.
http://www.realaspen.com/article/212/Colorado-Division-of-Wildlife-Harassing-big-game-with-aircraft-is-illegal-unethical
Its legal in Colorado given a vey specific set of rules.