Arboretum
Many spacecraft have a deck set aside for the study of botanical life in space, this area is also meant to serve as a place where fresh fruit and vegetables can be grown, and where crewmembers can go to relax in an environment recreated to be similar to a planet environment.
This was tried on the Blue Dwarf, a full deck was especially set aside for an Arboretum, where plantlife can flourish under powerful heat lamps. But due to years of neglect, this forgotten garden has grown into a thick jungle where strange animals have evolved. Many species have been discovered here, from dinosaurs to killer tomatoes.