The gang settles into an old mansion previously owned by an infamous cartel leader. While Carol forces Tandy to put down his new toys so they can baby-proof the giant estate, Melissa worries about Todd's physical health and Gail and Erica can't figure out why Dawn won't stop crying.
Carol panics when Todd and Melissa leave for their honeymoon and Erica and Gail decide to live on their own for a while. She and Tandy devise the ultimate plan to convince everyone it's safer to stick together.
Pamela tries desperately to redeem herself with everyone, as the gang finally reaches Mexico. Meanwhile, Todd is disappointed that Zihuatanejo is not the paradise of which he'd dreamed.
Tandy devises an escape plan to get away from Pamela and back to Carol and the others. Meanwhile, the rest of the gang encounters a castaway, Glenn, who has been stranded on an island for years.
Pamela finds her place within the group as they all set sail for Mexico, avoiding the apocalyptic nuclear fallout in the United States. Their course derails a bit when they realize that none of them knows how to actually navigate a yacht.