I visited Rome for 3 days back in 2012 while visiting a friend who was working in Germany at the time; this was my first time traveling internationally. We stayed in an apartment in the area known as the Historic Center of Rome and didn't really venture outside this area that much, though many of the iconic elements of Rome - the Pantheon, the Colosseum, the Vatican, and many more - are either in this neighborhood or easily within walking distance.
Visiting Japan had been a goal of mine for years, and I finally got the opportunity in 2017. I began looking at tickets in the beginning of the year, looking for flights during the off season, and eventually found a nice price for a round trip ticket. A friend of mine was also interested in going, so we coordinated with an additional friend of his and picked some dates and started drawing up plans. We went for 2 weeks, covering the last week of October and the first week of November. We decided that our two weeks would largely cover Kyoto and Tokyo, with day trips out of each city to Nara, Osaka, and Mt. Fuji.
Ireland is a pretty amazing place. I had the chance to visit for 2 weeks in 2015. I went in October, as it's the off season and that usually means cheaper everything. The people were great, the pubs were great, the landscapes were great, and the weather was... well... the weather wasn't TOO rainy. Hey, that much green grass doesn't grow from nothing. So here was my itinerary; what I saw and what I'd recommend.