Interesting topic.
I used to be a very avid cyclist, raced quite a bit (left the competitive side of the sport as a Cat 3 rider). Recreational cycling does not take much time, but competitive cycling does! Logging miles to be competitive and then going to races burns plenty of time. Cycling clothes may look goofy, but are very practical if you ride any sort of distance and in varying weather. Now, I ride mostly with my kids (I have a 13 year old that climbs like a mountain goat.)
Although I walk 99% of my rounds of golf, I don't do it to stay in shape. More accurately, I stay in shape so I can enjoy golf more. (Run 15 miles a week on average for that.)
Golfing is a lot more mentally taxing than cycling, so that must burn some extra calories??