MIL's boss actually let us stay in the condo he owns down there as a wedding gift, so we only had to pay for our flights and activities. It was amazing! (A little beat up from Hurricane Irma when we went, but still a really nice area.)
A friend of mine got married in England, so we hit London, Birmingham, and then Rudgley (where the wedding was. We even went to Oxford, Bampton, and Highclere Castle! Afterwards, we took the Eurostar to Paris and saw the sights there. While in Paris we saw Versailles, the Eiffel Tower, the Louvre, and the Musee De Orsay! We enjoyed every minute of it!
We went to Fiji because they had a nonstop flight from SFO (we live near there) and for weather reasons. We didn't want to worry about hurricane season (thank goodness, our wedding was right after Harvey and Irma and during Maria) and we heard it was monsoon season in Thailand that time of year.
We haven't gone yet but we are going to Switzerland! We were having a hard time deciding where to go when I came across and amazing deal for round trip tickets. They were too good to pass up so we booked it!