You might want to have a look at: www.secretgardenplacencia.com
Lee does weddings, and could also probably help you with accommodations.
Also try www.destinationsbelize.com
this site will give you a very good oversight on Placencia.
There are many wonderful spots to have a ceremony as well as dinner/reception/party in Placencia.
End of November marks the end of hurricane season. You will probably still get some rain. Temperatures tend to be a little bit cooler going into December, so a fan will probably be just fine.
If you would like, you can email me at[email protected]
for more information.