No special access issues
For Max' wall and The Dog, parking is possible at "Yliskylän koirapuisto" (🚶♂️440m) or "Laajasalon Liikuntapuisto" (🚶♂️600m). Both options leave you with an approach of a few minutes.
For Rauni we recommend parking at the Northside of the marina (🚶♂️350m).
The spots are well reachable by (city)bike for those living in East Helsinki.
Unfortunately, there is no city bike station very near.
Also public transportation is a viable option. Take the metro to Herttoniemi. From there, busses 84, 85, 86, 88 and 89 will bring you nearby. (about 700m walk)
For Rauni, the walk after the bus remains a bit longer. (1km)