I tried to visit the Wadi during my UAE trip late december. It was more a family leisure trip as ticking off WHS/TWHS but of course I (mostly without family) did visit all TWHS except those in Abu Dhabi.

Regarding Wadi Wurayah no review just a note: It's closed since 2012 until further notice. There is no plans to re-open at the moment. Entrance is guarded and no way to go in. Road further down was in not nice condition (not long used). This is to restore wildlife and nature.

Later at Mleiha Archaeological Museum I spoke to a person of the museum about WHS and he actually was from the Wurayah area and worked on the submission documents! He also confirmed it's closed and no plans to re-open. He said there are just a couple of yearly expeditions into the Wadi, scientific.

I do count my visit as the guard did let me drive 200 meters into the park 😇 for now..... not sure this will ever be WHS as it's already a biosphere as well.