Limehouse Conservation Area
Unique terrain, surprisingly not very far
Limehouse conservation area is a genuinely enjoyable park that I find myself visiting multiple times a year. Luckily it is very close to most of west side of GTA, and there is a big parking lot with picnic area.
There is always something new to discover in this park, it features a number of easy trails, the fun part however is where you have to jump from one rock to another or climb down a ladder and be between the rocks.