Camped in the Granite Gulch loop which is about 3 miles down the road after the ranger station. Plenty of trees, even some columbine flowers at the campsite. There's a vault toilet in the loop (no electricity, bring a flashlight!), looks like bear boxes are in the process of being built, and potable water is provided from a spigot back at the group pavilion (a few minutes drive down the road). Super easy to get in to Estes and do day trips to RMNP, plus Kruger Rock trail is a great hike right within Hermit Park.
No cell service until you get in to Estes.
Can buy firewood and ice at the ranger station, and they also have a pay machine outside that takes credit cards for the day pass, if they're closed.