I'd build an educational facility with large rooms simulating various ecosystems from around the world wih a glass wall down each one for viewing. The simulations would have to be incomplete with regard to large mammals, but I'd have a number of smaller mammals, birds, reptiles, insects, etc. appropriate to each habitat. The temperatures, humidity, photo cycles, and weather in each room would be carefully calculated to replicate what would be found in the animals' natural environments, as would standing or running water, plant life, soil type, rocks, etc. There would, of course, be veterinarians and zookeepers on staff, an apprenticeship program, a breeding program, quarantine, and on-site food production, as well as educational opportunities for schools, camps, and the general public.

Hey, a girl can dream, can't she?