Often in addition to my camp stool and art supplies, I have my binoculars, camera, food, and water. There's a handy storage area under the stroller that holds it all easily. As we know, Truman doesn't like to walk that much, but I do make him walk the first 1/2 to 1 mile or so, and then he gets to hang out in his stroller or nearby while I sketch. He is a very patient dog and does not get fussy at all.
Meadowbrook Pond park:
At the UW campus, I parked myself across the street from the main entrance (17th and Memorial Way) so I could draw the "W" -- I'm considering working my way around the campus from that starting point, week by week, sketching every part of the huge campus -- could take years!
I've already sketched several views on the campus, so at least I won't need to repeat those. Could be a fun project, and it's great that there is free parking there on Sundays and most Saturday afternoons.