I'm not retired, but do work a 4 day week with 13 weeks of vacation. My kids are still in school, so most of my time off I am at home. I have no problems whatsoever filling up my time, and I keep discovering more and more things I wish to take on and do. I have pre-existing hobbies-- running all year round, skiing in the winter. Now I've started cycling and learning a new language, which I'm enjoying so much right now. I'm also trying to build a ski press to make my own skis. I've been helping a friend with a start-up small business. I became a board member of a non-profit org. I volunteer at my children's school. I spend a lot more time with my wife. I take my kids after school to karate, ballet, religion classes. I need to get FIRE'd soon so I can continue to do all of this and continue to expand my interests. Although there is nothing wrong with sitting around doing nothing, there is so many exciting things to do for anyone who is retired. Retirement (or time off, in my case) is a great opportunity to be productive in society, or be a better spouse/father while doing things you truly enjoy, in contrast to doing something you can't stand only to fill the pockets of MegaCorp.