Anyway, as promised, here is a post about the rest of Universal Studios!
After Diagon Alley, we rode the Hogwarts Express from the Universal side of the park to Islands of Adventure (Hogsmeade Station). We went through Hogsmeade, the older Harry Potter section (Diagon Alley opened the week we were there, & Hogsmeade opened about 4 years ago. This was our second time at Hogsmeade). We explored the shops here, got some postcards postmarked from Hogsmeade at the Owl Post, then ventured on.