I didn't read any other responses...
We tried to take breaks when DS was 2.5 and DD was 8 months. It was a nightmare. DS got so worked up about leaving that he threw a fit, then when we got back to the hotel (on site) he was amped and refused to sleep. All he wanted to do was get back to the parks. Since then we never take formal breaks. When we had a stroller kids napped in the stroller. Sometimes it would take work, lots of monotonous walking in areas that were not stimulating, but other times they either just fell asleep or skipped it altogether and were fine. If we were only going for a day there is not a chance we would take a break, especially staying off site.