Eli Manning Soaking Up Retirement On Golf Course With Peyton

Here's Eli Manning clearly devastated he ain't playing football any -- AHHH JUST KIDDING!! ELI'S HITTING THE LINKS WITH HIS BIG BRO AND OBVIOUSLY LOVING RETIREMENT!!!

The ex-NY Giants QB -- who just officially called it an NFL career on Jan. 22 -- hit the pro-am at Pebble Beach on Thursday ... and he sure didn't look like a guy who's missing getting hit for a living.

Eli and Peyton were part of a foursome alongside pros Kevin Chappell and Luke Donald ... and the Manning bros actually played pretty well.

Eli -- a 10 handicap -- posted an 8-under total with Chappell ... while Peyton -- an 8 handicap -- carded a 5-under with Donald. Not bad for two old retired guys!!

Of course, the tournament's also filled with a TON of other celebs and athletes ... including NFL legends like Steve Young and Larry Fitzgerald.

But it was another QB who stole the highlight show for the day ... Aaron Rodgers made some tremendous shots on the course -- and even walked in one of his putts!!

And, as for the non-professional athletes, country superstar Jake Owen really had himself a day ... check out these two shots he poured in from distance!!!