I've been to Malheur, staying in Frenchman Glen in late April and exploring it as best I could over six days - it's vast, and much of the land, mostly scrubby High Plains-type land, bordering the wetlands contains interesting hotspots of cliffs, clumps of woodland and bushes. There is an interlinked network of tracks across it, a work in progress, because the main problem is finding and extracting miles of overgrown and collapsed barbed wire abandoned by earlier ranchers.
Once this bunch of deluded numpties have been dispersed, it'll return to being one of the most fascinating protected areas I've ever visited. Many migrants use the area as a Spring stopover, particularly species not normally associated with that habitat, or in deed that general region. At the northwest end is a large lagoon crossed by a narrow causeway just wide enough for vehicles to pass, but without any safe viewing points on it.
MJB