First of all, if you are an overseas visitor and intend to visit several English Heritage sites such as the priory, consider buying a 9 or 16 day pass, you will save lots of money. We visited the priory on an overcast day in August and there were probably only a dozen people there so we had an excellent opportunity to have an unobstructed view of everything. There are a thousand years of history on the site, and you might get more out of it if you have a guidebook. We did, and it helped to make sense of what we were looking at. The views of the sea and the village are beautiful, and there is plenty of greenspace for children to play or to have a picnic. There is a small gift shop with a very helpful staff person. Compared to some of the other sites we visited, this one seems like it would be good for those who have mobility problems.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.