I don't think you can. I don't know if you have to have sims 3 ambitions, or pets to do this, but you can take up to five days, unpaid vacation if you use the phone.
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No. You must have The Sims 3 World Adventures installed in your computers in order for your Sims to go on vacation.
I don't know if there really is a mermaid but supposedly you have to take the island vacation
you have to have a level 3 Visa for the location of the home you want, once you are level 3 then you can use a phone and have the option to buy a vacation home.
i don't think you can take a pregnant sim on holiday
A Sim won't go into labour when they are on vacation, but non pregnant Sims can conceive during the trip.