Our son Chris 22(red hair) arrived at the Belize airport on Mar. 31 (Sunday) where he was to meet his sister 19(Natasha) who was coming from Nicaragua and they were to backpack together in Belize, Guatamala and on towards Costa Rica. They were going to find accommodations after they met. They had strict instructions to phone or email us as soon as they got together so we could quit worrying. They are good kids but we haven't heard and we are very worried. We need to know if it is very hard to have the use of a phone or computer. Could they possibly have run into trouble swimming or hiking and noone would have seen them. We also need to know where to begin looking for them. Thanks in advance for any advice.