This is historic Keila landmark - place between the river branches, where old castle was built and manor house later. You can find ruins partly renovated now. And newer manor house including Harjumaa County Museum inside.
Keila town, people can lead You to the place but You can reach eila river park Your own:
1. Backbacker: reach Keila town hitch-hiking from Tallinn to P?rnu direction, turn right on Kanama crossing (Keila direction). Face towards Keila church - the Keila river park is left, cross the railroad near the river, and Tou are almost there. Try to find the Museum, ruins are right beside the museum house.
2. As a tourist - find out local travel agencies making trips to Harjumaa West part: Keila, Paldiski, Laulasmaa (great new Spa), Kloogaranna, Padise are the most important points. This travels include visit to keila also.
3. Travelling Your own - rent a car, use railway or regular bus to reach keila town. By car: out the Tallinn by P?rnu direction, after 10 km on Kanama crossing turn right, Keila and Saue direction. After 10-12 km You are on Keila town. Buses: use lines N?va-Haapsalu (just Haapsalu is not going to Keila), Paldiski or Keila.