While the city of Belfast is great, I was near the Giant's Cause Way and the Carrick-a-Rede rope bridge:
The bridge was originally built by fishermen to catch salmon, but now the salmon aren't in the area, so it's just a tourist attraction. The internet made it look a lot bigger, but it was still cool.
Our bus driver literally didn't shut up for the whole 6 hour tour, and while he was blabbing away, we saw dolphins out the window that no one else saw because they were all put to sleep by his voice.
Giant's Causeway - a bunch of hexagonal stones
The big round rocks look like meatballs