A navigation along the Beagle Channel to Isla de los Pingüinos — Isla Martillo, the penguin colony east of Ushuaia, where Magellanic and gentoo penguins breed from October to April.
The tourism secretariat's agency register lists their office at Gobernador Paz 95, and the WhatsApp on their site is the one the register gives; the pin marks Isla Martillo, where they go. They do not appear on the municipality's list of penguin-colony providers, so ask exactly what the trip includes before booking. Book by WhatsApp.