My family belongs to a Walking Club (Walk'n Mass Volksport Club) and are used to walking 10K (6 miles) events. By the time my son was 4 he was able to walk about 5 miles, during these events. I had a Jogger Stroller and he would hop in as needed, but walked most of the way. (The stroller carried our water and snacks. LOL) When we arrived our first day in FL We came from Winter temps of 20, and snow to a very humid day in early March of 90. We went to AK the first day late in the afternoon. We were barely there a half hour and my son was asking why he didn't have a stroller like the other kids. And he really seemed tired, since we walked to the end of the park for the Safari. So we went and rented a stroller for 2 hours!!! He was so Happy. My son had the stamina to walk to the end of the park and back several times, but with the additional overload of the senses, I think the stroller was a way for him to escape from the exposure. So I think the strollers could also be thought of as the childs own space, away from all the noise, and strange sights and sounds, and people, they are safe in that stroller. So from that day on the minute I walked into a park, I rented a stroller for my son, not because he couldn't walk around the park, but for a little escape, so he could have peace of mind.