Also check out
www.dailycheapreads.com. Nice website. They generally only post "clean" books whereas on other sites, you'll get a...hmmm... interesting selection of titles. Ask me how I know.
I have a ton of games and apps on my Kindle fire, and also a million books, of course. I don't use mine for e-mail or Facebook, I only use my laptop for those.
I'm also a member of Amazon Prime, so I can hook up my Kindle Fire to my TV (it has to be a newer television with an HDMI connection) and watch tons of TV shows and movies. I also stream my Craftsy classes to the Kindle and in turn onto the television. I love watching them on the bigger screen.