Noun, Suru verb, Intransitive verb
enrollment in kindergarten; enrollment in nursery school
おい、クレオ。あんまりうろちょろするなー?まだ入園したばっかりなんだぞ。Hey, Cleo. Don't wander around too much, OK? We've only just entered the park. entering a park, garden, zoo, etc.
Also written 入苑【にゅうえん】