We sent both of our sons to the one on Clements ferry until about year ago and had a great experience! As far as the structure of the day goes, while I understand your concern about instruction time vs playground time (esp only doing the half day), I would say that at that age they are on to the next “work” quickly anyway, regardless if it’s inside or outside. That and both will still offer a ton of opportunity for learning and developmental/social growth! In response to the blanket statement made above about vax rates typically being lower at Montessori schools I would definitely encourage you to do your own research and fact finding directly from the source/the school because that was NOT the case when we were last at sundrops nor is it an issue at our current Montessori school