What are the good outdoor activities for a 1 and a half year old?

I think there's lots to do at the beach. I particularly like going to Pasir ris beach when I was younger. We could do so many things. It was there that I learnt how to ride a bike and to rollerblade. There was also a fish pond and me and my sister used to feed the koi fishes there bread. There was also a huge sand playground with a huge spiderweb thing. Plus, there were other kids there too so it was very enjoyable. Also, it's cheap and practically cost nothing, assuming you have your own bicycles and rollerblades. It's good bonding time with the family.