Can anyone please help me with this card, it is so confusing.
This card appears to be poorly translated into English from a French version of the game. In the original English, it would be "Advance token to Boardwalk", so you simply move you token forward until you get to Boardwalk, and then deal with it normally (either pay rent, or purchase it, etc).
In the official French version, the card says "Rendez-vous à la Rue de la Paix". The Boardwalk space is called "Rue de la Paix", which translates to "Street of Peace". And "Rendez-vous" is literally "go to", but generally translated as "Appointment" because that's also how it is used.