Firstly, welcome to the forum!
And actually you can gauge many parents' evaluations
and sharings on their childrens' enrichment activities
by clicking the KiasuParents.com Forum Index. Under
this header, there are various discussions with regards
to enrichment services. Search under services.
Btw, 4yrs old can attend many enrichment programmes
already. Old enough to go for academic reinforcement ones
or fun ones for extra recreation.