Learn to dance tango. You do need to come with a partner.
One hour class.
Clothing: nothing restricting movement.
Shoes for men: flexible, leather soles, no ridges. (No rubber soles but worn trainers can be suitable if they don't adhere to floor)
Shoes for women: flexible, preferably strapped, leather soles, not too high a heel to start with, also avoid ballerina-style trainers (with no heel)