Last year one of my girlfriend's cousins got married to a Swedish guy (she's Irish). As family is in multiple places around the world, she got married in the US, reception in Northern Ireland, second wedding/reception in Sweden, and a second reception in London before moving to Orlando (she want's to work at Disney).
For the wedding, we flew down to New Orleans, toured for a day and then headed up to the wedding before returning.
For the reception though, Jeanne (my girlfriend) wanted to go partly for the cousin but also to visit her sister in Northern Ireland.
We flew to Dublin and walked the city for 2 days before getting a car. Driving on the left was interesting to say the least. I actually clipped a bus with the mirror on the left side. But within a couple of days I had it down pretty well and we were tooling around Northern Ireland without much trouble.
After the reception, we headed up to Belfast and took a puddle jumper over to The Isle of Man. I wanted to go because the TT and just to wander around and check it out. The first night though, Jeanne surprised me with a 7 hour, one on one motorcycle tour of the island focusing on the TT. History, corners, plus lunch and other bits about the island. Honestly it was a total surprise and great fun.
From the Isle of Man we went to Scotland, took a tour of one of the scotch whiskey (I hope I did that right; I don't really drink) tours which was interesting and headed home.
Overall it was a great trip enhanced greatly by the Isle of Man special surprise.