Underground Thorildsplan and a walk through the park, bus numbers 1 (get off at Gjörwellsgatan, somewhere in the neighbourhood of the DN/Expressen building) or 62 (Rålambsvägen) or 4 (Västerbroplan and two minutes walk)
Note:
- it's Halloween, so dress up
- there will be a sauna - hopefully hot - so bring a towel