As parents we often attempt to tell our kids how to play or where to play. But sometimes, it's good if we just sit down and let our kids play by themselves.
Some kids need time to acclimatise to the new environment, to start climbing up or to make contact with new friends, especially toddlers that still like to stick to their parents. That's okay. Give them time and let them observe a bit first. Eventually they will venture out and start playing.
The playground is their place and not ours. It is good to supervise kids, but still let them do what they want. We can encourage them, but we should avoid forcing them to do what we want.
If our kids want to watch ants for a while instead of use the playground equipment, then we should let them do that. Watching ants is a fun learning experience too!
If toddlers are trying to climb and it takes a bit too long, just let them take their time. Don't rush and don't be stressed, even if others are waiting their turn behind your child. If safe to do so, you can tell the waiting child to go past. You can guide your child by saying how to move (left foot up!), but the important thing is that your child is making the movement by himself. Don't push or pull. It will help your child learn and they will be more proud of themselves in the end.
The most important thing kids have to learn is how to play on their own and have fun with other kids. Learning by doing!