• About 25 minutes on the river, out of a 90-minute ride with no stops, so use the toilet before boarding
• A steep 5-step ladder that every passenger must climb unaided, so the tour can't take wheelchair users or anyone with reduced mobility
• Open-sided and runs rain or shine, with windows that close in the rain; if the river part is canceled, half the fare is refunded on request

HIPPOtrip is an amphibious bus that tours the city by road, then plunges into the Tagus River for about 25 minutes on the water. Live entertainers run the show in Portuguese and English, with myths, legends and trivia, and get passengers shouting along.

The route takes in Cais do Sodré, Bairro Alto and Belém. It suits kids who want a loud, silly ride, not a quiet guided tour.