I used to live in Lyons... about 1/2 way between RMNP and Boulder. You will drive through there if you are headed in from the east.
There are some great locations to shoot around there. I would suggest taking the Fall River Road route to the alpine visitor's center. You might actually see some sheep.
As far as in the park, you would be much more pressed to find a place that does not offer a good spot. It really is that great. Sometimes, I would see Elk down around the Big Thompson river in the valley not far from the east entrance (Estes Park side) by the Fern Trail head.
Speaking of Estes, you might pause for a moment there and get some shots of town. Everyone shoots at the park... and do that too... but there is a great outdoor dining area behind the outdoor mall in Estes. The river runs right through it and there are some great places to photograph the area.
If you find yourself in the surrounding area, just south of the park on the east side are a few places that might be good for photographs.
Raymond is a small area that consists of some cabins and one very old store (
http://maps.google.com/maps?ll=40.15...oid=po-6927020). There isn't too much to see, but there is a certain amount of charm. Nederland is where you want to go if you feel like taking photos of folks who have dreadlocks and their wardrobe is primarily comprised of hemp products. :)
Morrison has some great little antique shops and a few good places to sample the local fare.
On the west side, Grand Lake is an essential stop. It isn't usually as crowded as Estes and the shops are great. You can go on the boardwalk right around the lake and even rent a boat if you'd like. Also, the Aspen trees are much more plentiful on that RMNP / Arapaho National Forest border as you come out of the park on the west side.
On a side note, if it is near lunchtime on your way up, stop in Lyons and eat at Oskar Blues. A bar in the basement with live music and a great little restaurant upstairs.
It is a beautiful area. Let us know how things turn out!