We were on the Infinity this past February and the worst seas were from Valparaiso to Puerto Montt. Other than that, the Strait of Megellan and going around Cape Horn were absolutely calm. Our lecturer said he hadn't seen Cape Horn so calm in the 20 years he's been doing this. All other ports on this cruise were terrific, only bad weather was on the Falkland Islands and a rainy morning in Montevideo. You'll love this cruise! If you need recommendations for private tours in Puerto Montt or Buenos Aires, let me know.