AZB said:
If you would be staying in a building then there is a chance someone will have a wireless broadcast in an apartment near your place. if the wireless is open (meaning without a security code) then you can steal their signal and get connected via your laptop).
AZB
If you will be so lucky as to have wireless signal in your apartment, and in very unlikely case that your neighbor was so savvy or paranoid as to lock the signal, download WEP cracker off the net and (assuming that your WiFi savvy neighbor has any decent traffic on his wireless) you will have password in a few hours.
You can increase your chances for picking up wireless by using one of Linksys routers re-flashed to become a receiver (search web for the models which are suitable for it).
Disclaimer: information above is provided for educational purposes only and not intended to encourage theft of wireless bandwidth from unsuspecting neighbors.
Almost any internet "cafe" will let you connect your laptop to the LAN, there are plenty of those places around SD. Cost can be as low as RD$25/hour (less then a dollar) in small place up to RD$120/hour (about 4 dollars) in fancy location in one of central malls, but in any case it should be affordable enough. Be very careful carrying laptop on the streets though?