I can recommend Elm Park Nursery on Clarence Avenue. My daughter has been going there for nearly a year and loves it. They have a huge garden for the children (including a rabbit) and go out every day. The children have age according rooms (3 months to 1 year; 1-1.5 years, 1.5-2 years, 2-3, 3-4) which I find important. From 2 years on, they offer additional activities such as football, tennis, ballet and from 3 years on they go swimming. Really sweet environment with nice staff. I recommend you go and have a look around.