Have fun there. My Malaysian friends think it's beautiful, but like jail. Lots of laws I hear. (Malaysia is immediately North of Singapore)
As for the JW's in Singapore, I think they can have meetings but they can't try to convert anyone. It was that way on my last trip anyway. For instance, they can't sit in the park and read a WT and strike up a conversation with someone. Bibles are not commonly seen, and may be illegal to display in public too.
In Malaysia, it is against the law to try to convert a Muslim, and it is a Muslim government, so they are operating pretty precariously. I went to the Memorial there in 1997 and had to go through a lot of red tape before I left home, to even get a contact phone number. They are very, very careful there.