Bike rentals in Vung Tau?

Hi,

Planning a day trip to Vung Tau from Ho Chi Minh via Hydrofoil this Sunday.
On a solo flight this time, so not going for those Tandem bikes.
So here are my questions:

-Anyone know any bike rental shops by the port?
-How much would it be to rent for a day?
-Any experiences with bike renting (any scams or rip offs that I should be aware of)
-Also, would it be safe leaving the bike when I go take a dip in the beach or walk up to the Christ statue

Any input is much appreciated.

Thanks!

-Janice