Central America should be sunny in December, with cool winds blowing from the North.

Decameron Resorts has two locations in Central America: Salinitas, El Salvador and Panamá. Panamá is much safer than El Salvador, but inside the resort or during resort activities safety shouldn't be an issue.

Both of them offer extra activities, check if tours and activities are sheduled for the dates of your visit.

From Salinitas, El Salvador there day trips to Copán, Honduras (Mayan Ruins) and Antigua, Guatemala (Nice colonial town in highlands, touristy on weekends).

Check out the links for local activities in both resorts:

http://www.decameron.com/eng/salvado...ctivities.html

http://www.decameron.com/eng/panama/...ctivities.html