I traveled to America last year and had intended to visit a Prince Hall lodge, but when I submitted my request to Grand Lodge of Scotland, I was informed that they were not in Amity with MWPHGLDC so could not visit any of their lodges at that time. At the time I was told there were a few that had the same issue in other states, this reminded me that I will need to check for next year as we are heading back to Atlanta for our son's graduation. I believe there are still one or 2 states where GLoS are not in amity with the regular Grand Lodges either, which makes traveling interesting.
I did manage to visit Federal Lodge #1 in DC and was warmly welcomed after being tested.