In my opinion, thankfully, the dress code in Chapala and Ajijic is very casual. There is not really any dress code of note here. You will see people in khakis and cotton shirts, shorts and t-shirts, sandals. December is a bit cooler so you might have to dig a jacket out. But in general, the dress code in Chapala and Ajijic is pretty casual. 
Well, seeing how the people so far that have responded have a bias, let's not leave out power blackouts, water shortages, slow internet, insects everywhere, heat, heat, oh did I forget to mention heat? Electricity so expensive you can't afford to use AC, except in your bedroom at night. Roosters crowing at all hours, dogs barking for what seems like hours, local neighbors that chum up to you so they can borrow everything you have, cheap but crowed busses. A capital city with no street...
It’s fairly easy to get a Belize driver’s license. Simply fill out the application form, sign it and also get it signed and stamped by a government medical officer.
The Algarve has hardly any blackouts or brownouts. We have a very, very reliable power source. In a typical year, we will have zero blackouts or brownouts. 
Those B! banks!
BANKING-- despite all their assurances that you have set up all the correct procedures and accounts, there WILL be problems. Not in your host country, but 'back home'. These will take the form of excessive fees, limitations on the maximum allowed currency, changes in their regulations, both Governmental and internal bank rules, staff changes, lock-outs for internet transactions and many, many others.
Should you try snail mail it may take weeks of effort; I once took a certified bank check wih...