You are looking for a camoed bison tube.
We were in this park turning some DNFs into finds. Afterward we decided to check out the park. It is a very nice park. Then we noticed that we were far enough away from the closest cache to place one more. I found a cache placed like this one in Florida. It was a prety clever hide. I hope you enjoy it.
This park will be busy in the summer so stealth will be required. The park is open during daylight hours, so no night caching unless you want to be muggled by the police.