I am guilty of planning to make a plan when i get there and then just have too much fun to actually make the plan.
I've had days like that.
And there are times when I get there, get out targets, look at them, and decide that I'm just going to toss my plan and work on one thing that I'm already decent at, just to see if I do something ridiculous. (Hasn't happened yet, but it is sure fun to try to get a .65 draw from a surprise start on a 7-yard A-zone...not really useful, but fun!)
Most times I stick to my plan and work on the things I suck at, but sometimes I'm just not in the mood, and need to have fun---but I don't want to walk off the range without being better at SOMETHING.
Draw to a 3-yard target and then transition to a 40-yard popper? SURE! One-reload-one-reload-one-reload-one, all A-zone hits? SURE!
Plate racks at 15 yards for speed? SURE!
...most of the time I do actually work on more helpful drills.