I tought about it a while, and by what I understood from the consensus on the wiki is that the museum is not free, if you want to visit it you need to pay a fee, the fact that you have to walk through the garden to reach it doesn't mean it's free from a fee. it still has it. the only way to make it clearer would be to invent a new value for the tag, fee=connected (or similar), that means that it's the same, not an additional one. we might discuss it somewhere better maybe?