This is a walking destination, not a drive-up viewpoint. The usual approaches are on foot from Levisham village or Levisham Station, or as a detour on longer routes linking the Hole of Horcum and Levisham Moor. One well-used circuit from Levisham runs about 7.4 miles (12 km) with roughly 900 feet (273 m) of ascent, mostly on good paths, and takes around four and a half hours at an easy pace. On-street parking in Levisham is often available, but treat that as route context rather than a promise.
There are no facilities at the tower: no toilets, no parking, no cafe, nothing staffed. Levisham Station and the Hole of Horcum car park are separate places with their own arrangements, and neither is close enough to count as a facility here.