I’ve got extra logs and looking for some art ideas for them. I did arrange some large half logs in a spiral to make flipping logs, so the visiting kids could look for creatures. What else do you have?
I would think of climbing and balance activities. I've seen a line of logs planted in the ground, each one taller than the one before as if they're climbing a staircase. If it led to a raised platform where they could look out over something, that would be even better.