Sure...We liked Elk Meadow Lodge and RV Park. Sites are fairly level, although tiered. FHUs and the staff was friendly, also for the area, decent price. IIRC, the CG is just outside Estes Park and very close to the entrance to the East gate of RMNP. View from the CG sites are nice and sometimes in the early hours, Elk frequent the CG.
https://elkmeadowrv.com/rates/
Also, check with the park for road conditions on the Old Fall River Rd. When we were there, a normal car would have no trouble with the 11 mile, one way dirt road that winds it's way up to the Alpine Visitors Center. It's best traveled early before the guided tours scare off the wild life...it's a great ride.
As a side note: I may have posted earlier that the CG was 'Elk Meadows RV'...which is somewhere in Washington state. Sorry.