I would say for me
an art class (beginners drawing / life drawing) .. although it is internal rather than external so don't do this to make friends but rather to lose yourself for an hour or two
a dance class - look for something like ceroc (quick to pick up and normally doesn't attract geeks) ..you could go together or alone
a reading group or a 'knit and bitch' group
I think you may well find when ds starts nursery you will make lots of like-minded friends so leave room to build those types of relationships