Yes, Eunos mrt is very far!
The only walkable one I think is Kaki Bukit station (under construction, ready 2016?)
But from main gate, is uphill all the way till main road Bedok Reservoir and across via Jalan Tenaga to reach.
Quite a workout when going out (uphill), but coming back via this station(downhill) should be fine?
Thanks for the reply!