I don’t want to do anything extravagant for my twentieth birthday. All I want to do is read a good book.
A luxury swamp. Really? You got yourself a luxury swamp? That's not even a thing, not to mention probably really expensive. You are being too extravagant.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.