Did it take a while for you to just sit back, realize you didnt have anything pressing?
I'm with OldGuy-- ER is no time for relaxation. Get going!
The first day of my terminal leave (before ER officially started) I walked up to our local rec center and started swimming laps to build up my surfing muscles and aerobic endurance. (I built up to a mile.) Then I spent time on the Internet learning about surfboards, requesting surfing books from the library, and looking at the sales on Craigslist. Why, some days I barely had enough time left over for naps or reading or home improvement or whatever else spouse thought I should be doing with her.
For the first month of leave, those naps were 2-3 hours long. I must've been chronically fatigued. Today they're more like 30-45 minutes.
I kept up this brutal routine for nearly three months (including the naps), but it was worth it to be able to paddle into those waves on my first official day of ER and stand up. It was good to be able to buy a few used boards, get my water skills, and then go shopping for a nicer one. And it's been worth it to cajole our kid to spend quality time on the waves with her dad.
We've taken the same approach with taekwondo, the house & yard, the rental property, and other new skills. And I still take naps.
As the word spreads that you're ER'd, be careful. A friend of spouse retired from the service a couple years ago. She admits that most of her time-management problems stem from being unable to simply say "No, thanks". As a result she's found it easier to get paid to work a 30-hour week than to submit to volunteering for 50-hour weeks. This woman so desperately needs a copy of Bob Clyatt's books and one or two from Ernie Zelinski.