1. THE SAND TRAP
Not only is there a lot of great reading material on here, but it's also a great place to communicate with fellow golfers. You can post videos of your swing and get advice from of a community of golf fanatics like yourself.
2. MYGOLFSPY
A great site for time-killing if you want a quick swing tip, a new drill or read about some of the new and exciting equipment in the industry. I've found that this site is focused primary on equipment so if that's a topic you enjoy reading about, have a field day!
3. NO LAYING UP
Great for fans of the PGA TOUR who enjoy a little bit of humor in their content. Their podcasts are very fun to listen to especially when they chat with guests like Rory McIlroy and Jordan Spieth. While you're at it, give them a follow on Twitter as they are very entertaining during Tour events.
4. GOLF VACATION INSIDER
If you've got a case of wanderlust, this is a great blog for you. You can plan or even just fantasize about a dream golf vacation by reading their reviews of golf resorts and travel destinations.