Shopping Day Trip To Chetumal

to try and answer your questions:

1.  what to expect at the border?  that all depends on what time of day, what day of the week and if a holiday is in the near future.  And that pertains to both sides of the border.  I know that isn't a sufficient answer but if you could be a little more specific it would assist.

2. where to exchange BZ $ for Pesos....right after you leave the Belize Immigration building there will be Peseros who can change them for you.

3.  Driving in Chetumal is like driving in any fairly large city.  By Mexican law you are required to have MX auto insurance.  Many will tell you don't need it...but if you have an accident without MX insurance you will automatically be at fault and there consequences are not good ones.

4.  What are you allowed to bring back?  Never, BY LAW, are you allowed to bring back beer, soda pop, fresh fruits or vegetables unless permission is granted by the BAHA jefe prior to crossing the border on the day of travel assuming you are returning the same day, and then some items are NEVER allowed.  Never on fresh fish, meats, dairy products. There is a limitation on the amount you can bring back from a border town which Chetumal is considered, I think it's $50 BZ per month, not sure, but sometimes that is not enforced. 

5.  Duty amounts?  any item purchased in Chetumal is subject to duty, but again, this is not always enforced.  Duty amounts vary depending on what the item is.  Check out the Belize Customs web page for specific rates.