Yes, get off at metro station Escuela Militar. A few steps away is the C20, a bus that goes ONLY to Parque Arauco (it makes continuous loops). Bus is inc in price of metro ticket. OR it's about 10-15 min. pleasant, attractive walk
Yes. It is to walking distance from Manquehue subway station (15 minutes, 6 BLOCKS). You can also get off @ Metro Escuela Militar and take bus that goes to Parque Arauco (#20)
Get quick answers from Parque Araucano staff and past visitors.