Running Brook Day Camp Pay for one week, get the second free! Running Brook is a camp dedicated to children having fun! Located at the Chapel Hill-Chauncy School in Waltham on 35 acres of beautiful woods, the camp’s many facilities include an outdoor swimming pool, indoor gym, art barn and playing fields.  A huge favorite of many Lesley Ellis families over the years - your child is bound to be in camp with someone he or she already knows from school.