Technically none, but having certain skills will make the adventure progress a bit quicker. What skills do I need to go on adventures?
Female Sims who have shown signs of morning sickness but are not showing their pregnancy (and therefore haven't yet changed into maternity clothes) are allowed to go on vacation. Also, infants, toddlers, and female Sims who are showing their pregnancy are banned from travel. That means if two Sims are best friends or even engaged, if they don't live together, they cannot vacation together. Yes, but you can only travel on vacation with other Sims who live in the current lot, regardless of relationship level.
