Trump discovered in Saudi Arabia that Islam isn't so bad, after all. But then, selling $150 billion in arms can help improve one's perspective.
Trump made a series of small mistakes in Israel, which might have been avoided had Trump been willing to use State Department expertise instead of relying on White House staff.
Trump appears to have had a nice chat with Pope Francis.

So, was this a trip to see the sights, to rack up frequent flyer miles, to embark on a spiritual exploration, or to "rough it" by sleeping somewhere other than in a Trump property?

I don't think Middle East peace was advanced.
And I think American presidents should quit trying.