We were in London when the kids were little, but we had an amazing play group just around the corner and we were there every morning. They had everything; paints, play-doe, climbing frame and a sand pit.
We first went there when my eldest was just crawling so he was probably about 5 months when he discovered the sand pit. My poor youngest was there at just three days old because I had to look after both of them.
Kids will love sand, mud, paints etc at any age - just go when you feel ready to cope with the chaos - because I guarantee it will be stressful and hard work aswell as brilliant fun.
Ahh okay @mirriek it's great to know that your son handled the sand pit well at 5 months old - that means that Zac should be old enough at 14 months.
I didn't think about it being stressful. I guess I should really make sure that we remember to bring the wet tissues to clean off the sand when he gets dirty, or at least for once he is done playing.