take a boat from changi ferry terminal. each person cost about SGD 2.50. the boat will operate when there are 12 people boarding.. so you may need to wait...
when u reach pulau ubin, you can choose to rent a bicycle at SGD 6 for the whole day. if not they have packages. rental bike + 2hrs of karyaking OR 2 hrs of karyaking + fish spa OR fish spa + rental bike for SGD 10!
the cycling trails are wonderful and you get to see how a mini kampong is like! the scenery is very nice! rmb to bring enough water with you as it will be very humid. basically you can spend one whole day in the island. they have fresh coconut drink near the jetty and very nice seafood stalls around! do try before you leave!
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