On weekday and Saturday u can try "kranji shutter bus" $3 hourly interval whole day trip from Kranji MRT. Just tell the driver the address LCK201 and when is the pick up time.
Pls find the schedule below pdf, and bear in mind, the bus fare changed recently to $3:
http://www.kranjicountryside.com/kranji_express_schedule.pdf
http://www.sbwr.org.sg/downloads/KranjiExpress2008.pdf
On Sundays and Public Holidays, u can take Bus 925 from Woodlands interchange, Marsiling MRT or Kranji MRT. That is drop point at Neo Tiew Road Arowana Farm just 2 Block from LCK201 (less than 200m).
Or let the bus driver know your drop point Bus Stop No 49249 Venue : NEO TIEW CRES DRAGON FISH IND
http://www.sbwr.org.sg/visitorinfo/gettingthere/kranjinaturetrail/
Detail Route...
http://www.transitlink.com.sg/php/eguide/service.php
Hope above helps......
Cheers and Happy Reefing....