That was my thought too Michael. Gentry (Field Guide To The Families And Genera Of Woody Plants Of Northwest South America) mentions both Viburnum & Cornus, though not by species. The only specific listing I have found for Viburnum in the area is V. costaricanum, which is a possibility, but I haven't found any photos to confirm this in any way. http://striweb.si.edu/fortuna_plants/details.php?id=25
Thanks, David - that may be yet another possibilty. The tree in the photo was found growing about 25 miles (as the crow flies) from the Costa Rica border - so right area.