S.L.
I'm laughing cuz My five and a half year old just had his first tantrum, sat in time out crying and saying things like I will never eat dinner again, this is not good, I will never play with my friends again, I will never do homework again, this is boring, etc etc etc I'm looking at him thinking WOW first fit at age 5 and a half??? (this was over not wanting what we served for dinner) He is now happily eating seconds on the dinner he refused an hour ago! I'm going to blame it on tiredness and put him to bed earlier! I dont stress things like this cuz I have older teens and when they have problems their problems are more serious and I am not completely in control the way we are with little kids so I really dont sweat the small stuff.
Did your son start school in Sept or more recently? If he just started he could be over tired.
I hate the idea of you and your son not going anywhere!! I think you and he need to come up with a new plan for leaving the park/play date etc. Tell him your old warning system/ alarm isnt working well, act sympathetic to this problem as if the fault is with the system not him, now that he's five he should have a new plan and get him involved in choosing the new plan. He may need a few ideas to choose from....but he needs to feel it was his decision. Of course the new plan wont really be that different he just needs owner ship of the plan like a new sound, or instead of a fifteen minute warning look at your watch and say when the clock says 3:00 or 3:15 (three one five) a tiny snack waiting in the car.... Before you go somewhere remind of HIS plan he came up with, "remember you decided....." Hopefully the novelty will help for a while ....