Kindly ask someone with the same system as you, or at least another Apple system running the same major version of OS X as you, if you can look at their system. Inspect their network configuration, and find what is different about theirs compared to yours.
Or you could speak to the support staff at wherever you are staying.
I will be out of town for about 2 weeks, and while I'm here my macbook pro will not connect to the internet. Everyone else that has laptops, some even have the same computer, can connect to the internet. What do I do?