From "Centralstationen" goes both tram nr 1 (to Östra Sjukhuset) and nr 3 (to Kålltorp). Get off att the station "Stockholmsgatan/Härlanda Park" (station after "Redbergsplatsen"). Even bus nr 17 also goes to "Härlanda Park". Its also possible to walk from "Redbergsplatsen" in 5 min time.

Car:

If you are taking the E20, E6 or rv 40 to Göteborg, take the exit to "Redbergsplatsen", "Olskroken" and/or "Munkebäckstorget". "Härlanda Park" lies between "Redbergsplatsen" and "Munkebäckstorget".