By air: From Bogota, you can take an airplane to the city of Leticia for about 1 hour and 45 minutes with LAN or Avianca.
By river: You can also reach Leticia by river from Iquitos (Peru), a 10hour motorboat ride; or from Manaus trough Tabatinga (Brazil) in a tourism boat up river for 6 days.
Currently, the ParkĀ“s visitor center is closed to the public.