Hi Annie,
Sorry for the delay in my response to you. See below for a day-by-day list of the optional excursions:
Day 3 – Optional Valparaiso & Vina del Mar
Day 5 – Optional Mendoza Winery
Day 7 – Optional Tigre Delta
Day 8 – Optional Estancia Ranch
Day 11 – Optional Iguacu Falls from the Brazilian side
Day 12 – Optional Sugar Loaf Mountain
I hope this helps.
Kindest regards,
Monty