most of my summer Saturdays have consisted of:

-take kids to gym/pool in the morning. Drop them in learn & play while I workout, then take them to the pool for a couple hours while my wife gets a breather.
-Go to Sam's (the only Costco in town is 45 min away, while Sam's is 5 min, but same diff) for gas. Let them wash my windows.
-Shop at Sam's for food and booze for the evening's firepit. Usually it's a quick trip w/ only a few items.
-By now it's after lunchtime and the pizza slices are yuge, and the kids love it.

And I'm fueling up for the rest of the trip, because Costco comes after dropping stuff off at the dump, but before I hit Home Depot.

Costco is fine, just gotta be the first one in, and skip breakfast so the hot dog is more enjoyable.

I am a Costco shopper, but I do not like the person I become after finishing up there.

I grab it to go and eat it in the car on my drive home.

That's what really slows things down. I try to get in /out right at opening before they are sampling

It's a functional trip for me...not a daylong excursion