I've been around a long time, so I have a number of them.
A guy named Leonard King used to run a free agent camp in Atlanta after the draft. Basically, it was a low-budget open tryout camp for any wannabe NFL player, but because King had contacts in the league -- his claim to fame was discovering Alfred Jenkins, who turned into a good receiver for the Falcons in the 1970s -- some of the teams would send scouts, so it had some legitimacy (the catch was players had to sign an agreement saying King would be their agent if they signed with an NFL team). One year, I did a feature on this camp that ended up going something like 80 inches -- we split it up and ran it over two days. It was awesome (the event, not the story). Everyone had a story. There were a bunch of ex-college players -- some pretty good ones -- along with bartenders, truck drivers, a nightclub DJ, etc. The best part was hanging around the scouts while the drills were going on, listening to their banter and their take on who was an actual prospect and who wasn't, and of course, hearing their comments on the guys who had no business being there. The story turned out good, but the experience was tremendous.
My first Super Bowl was an eye-opening experience in more ways than one -- it was the year the riots broke out in Miami during SB week.
My favorite long-term story to cover was the Carolinas NFL expansion bid. The Richardsons and their people -- Mike McCormack, Max Muhleman, etc. -- were tremendous to work with, and the saga had all sorts of twists and turns over about a five-year span between when I started covering it and the Panthers started playing. Plus, I broke my share of stories while competing with the big guns of the Charlotte Observer, which made it even more fun. Among the highlights were going to Jerry Richardson's house in Spartanburg, S.C. and seeing his trophy room/shrine to Johnny Unitas and the Colts, and the time I had an interview scheduled with Richardson and he asked me if I wanted to go get something to eat. He took me to the Hardees on Kennedy Street in Spartanburg -- his first store, the one he bought with his NFL championship bonus money -- where I watched a billionaire chowing down on whatever the latest Hardees burger creation was at the time with the rest of us.
Someone earlier mentioned to Penn Relays. I covered a lot of track over the years, and Penn had by far the greatest atmosphere, thanks in part to all the Jamaicans in the stands. It remains the only sporting event I've ever been to where jerk chicken was sold at the concession stands.
Working the ACC tournament was always very cool to me, moreso than the NCAAs because the fans were so into it. But probably the best college basketball game I ever saw was Georgia Tech's victory over LSU in the 1990 NCAA tournament -- Lethal Weapon 3 vs. Chris Jackson, Shaq and Stanley Roberts. And covering Bobby Cremins was an absolute treat.
I got a chance to cover the Masters twice, and that was a tremendous experience. Augusta National might be the most beautiful place I've ever seen in person. And it didn't hurt that my first Masters was 1986, when Nicklaus charged from behind to win at age 46. The crowd was deafening. In fact, the lede for my story was, "The crowd roared Sunday at Augusta National. But the Bear roared louder." Still probably my favorite lede of anything I've done.
I also love stories that involve collecting tales from old-timers. My favorite was a piece on 1950s NFL linebacker Hardy Brown that I put together for the Star-Telegram's Sports Century series in 1999. I talked to Otto Graham, Pat Summerall, Glenn Davis, Y.A. Tittle and a bunch of other guys who played back then, and all of them had great stories. It was tons of fun. The only problem was a miscommunication -- I thought my story was going to be the cover feature, but it was actually an inside feature, which had considerably less space, so I had to cut it down severely. I kept a copy of the longer version, which I really, really liked, and actually sent it out with my clips for awhile (with an explanation of what had happened).