I think it would be good to build some kind of visitors centre in Amesbury - it would help revitalise the town.
Amesbury derives very little benefit from the national treasure on its doorstep. Tourists bypass the town completely, and if they do stay locally it tends to be in the corporate motel on the roundabout rather than the inns and taverns of Amesbury.
The population are pretty badly off compared to those in Salisbury, and it would be nice if the local politicians had the vision to do something good for our heritage and for local people at the same time.
Meanwhile, try to keep the ritual landscape around Stonehenge as free from modern intrusions as possible, although I think more needs to be done in terms of access for the disabled.