The cache is a small container which has only room for a few trading items, coins or TBs. You have to bring your own pen.
To open the cache you’ll need a very common tool. You will know which tool I am talking about when you have read the listing thoroughly. Please be gently so that other cachers can open it again. Please replace it exactly as you found it. DO NOT TRY TO OPEN THE BOX WITHOUT THE TOOL.
The final location can be an extremely busy spot at specific hours. Stealth is required when retrieving and re-hiding the cache. I suggest to take a rest and log the cache at one of the nearby benches.
Many thanks go to Cashub who tested my first puzzle cache!
Edit 30/10/12: Adjusted puzzle to match new conditions.