If you plan to stay in the parks and leave at the same time, I would take singles. We used Combi Urban singles for our older kids (both 8yo now) when they were younger--made splitting up for diaper changes/restroom breaks easier, we could roll single strollers up to tables at hotel food courts, strollers tri-folded and weighed 10 lbs for easy use on buses, etc. Now we have two more kids (4yo & 3yo) so we take a double because DH returns to the room in the afternoon while the 8yos and I stay out late, so a double is easier for him to handle on his own.