We visited Volcanoes during the government shutdown at the end of 2018, and even though most of the park was closed, we enjoyed our visit. The Visitor Center was open, and the rangers were super helpful and friendly, even though they were mostly giving people bad news about what little was open.
The center had some informative displays and videos, and a nice gift shop, typical of National Parks. After we got our passport stamps, we drove a short distance to one of the rim overlooks, where we looked through the mist in the rain at the distant crater floor, shrouded in clouds. The steam vents along the rim walk were a reminder of the volcanic activity under us.
Even though we didn't get to see much during our visit, we are still rating this NP five stars. We were impressed by the dedication of the employees and the sights of the areas where we could visit.