Use "can" with definitions

Can you not use "can"?

If you want to maintain the meanings of the sentences (which I assume you do), then you should use "can". By including the word "can", you are saying that the subject IS ABLE to perform the action (but does not necessarily have to).

However, if you remove the word "can", you introduce some ambiguity into the situation. Without the word "can", you might be saying "Tourists ALWAYS get information here", or you could be saying "Some tourists get information here". By including the word "can", it makes it very clear-- "Tourists may get information here, but they don't have to."

Bottom line (in my opinion): If some tourists choose to get information and others don't, it is best to use "can".

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Why use here instead of there?

By using the word here, the author suggests that he is standing AT the location spoken of. In the train station example, the author is standing AT the train station, saying that tourists COME to his current location. In the post office example, the author is standing AT the post office saying that you can post parcels and letters at his current location.

However, if the author had used there, he would be suggesting that he is standing somewhere other than the location spoken of. For example, he might be at his home and say that tourists can go there (to the train station) to get information.

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This is off-topic, but the same principle applies to "take" vs. "bring". Bring is what you use for when something is bring transported to your current location. Take, on the other hand, is what you use when something is being transported to a location other than your current one.