You dont need to take Annual Leave to go.
I went in Saturday and Returned Sunday.
At Tampines, I wait for 5am bus, reached Tuas Checkpoint at 6am, reach KSAB CIQ at 6:20am. Genting at 1230pm. Leave Genting at Sunday 1pm, Reach Tampines MRT shuttle bay at 8pm
If you are a gold card member, and visited more than once in 2 weeks, you get RM300 Travel Subsidy on the subsequent week (reset on every Monday). Go Sunday, and next day get another RM300, means RM600.
(Note: first visit no travel subsidy, must be subsequent visit within 13 days)
RM300 / 3.49 = S$85.90
This would help to offset about 50% of the bus fare there for 2 trips.
707 bus one of the cheapest of the popular bus operators.
If you had some GP on cards, room generally low GP, but most of the time for free rooms for members.