i believe it is really important that kids interact as much as possible with other peers. People assume that kids can automatically 'play' with others - but often kids need to learn the skill of playing.
the more practice they can have of these skills- especially before the age of 3 years- the better!!

What about just rocking up at the local playground and having him play- he will watch the older kids ' model' these skills and copy hopefully with his peers?
Story time at the local library- he may run around the first few sessions, but he will get the gist of what to do once he sees others- it will happen!!
a local play centre- great on cold windy days- they can run amock and awesome if you can take a friend with you so you can have a cuppa!!
contact the local playgroup association and they can put you in touch with a local group!

It is also important that you meet other mums as well!!! they say you make your life long friends through your kids!! Really important to get out there and socalise yourself as well- keeps you in the loop!!!
mwah hugs hun