G - we go pretty much every month or so (you will love it, esp if the market is on there or at the convent)
I think he will go better walking - there is heaps of space to run around and he will want to touch/feed the animals etc.
You could the the pram if you want to 'control' him more (lol) - but it is rough ground and i have found mine would never stay in there (too much space to run etc)
Its v safe for them to be out and about - soooo much fun!
My mum lives around the corner and often takes both boys for a run/pay/play and milk shake - she is able to control them both there as there is space etc.
(when is the party, chance we are going sat arvo for a play date)
xxx