I live in Lone Tree. It's a great place, and it's been ranked in some "best places to live" lists. While there are several good neighborhoods near downtown that would be more preferable for a single guy, Lone Tree is still a good option. DTC is 5-10 minutes away, Cherry Creek is 15-20 minutes, downtown is 20-25. The light rail has a Lincoln stop, but it's 40+ minutes to downtown.
There are a few decent bar options in/near Lone Tree: Fox n Hound, LoDo's (3rd floor balcony has awesome mountain views), Parry's Pizzeria (great pizza, 50 craft beers on tap). As you probably noticed, there are tons of restaurants surrounding Park Meadows mall.... awesome mall. There's a Rock Bottom Brewery across from PM, and a Yard House is opening soon. Also, Lone Tree Brewery is pretty good. Swingers is a cool bar with golf simulators to play golf in the winter. Castle Rock is 10 minutes south, and has a few good restaurants and Rockyard Brewery/restaurant (pretty good).
You're a golfer, right? Lone Tree is one of my favorite courses. There are plenty of great options: South Suburban (5 minutes), Saddle Rock (15 minutes), Plum Creek and Red Hawk Ridge in Castle Rock are pretty nice, Raccoon Creek in Littleton (20 minutes), Meadow Hills and Wellshire (15-20 minutes).
We should play golf or get a beer some time.
http://money.cnn.com/galleries/2009/moneymag/0907/gallery.bplive_6_figure_towns.moneymag/8.html