Senor Frog,
Sorry but no contacts...but, may I say,
Fantastic place, Costa Rica. Make sure your friends don't dally in San Jose too long as there is too much good stuff to see and do without getting stuck in a big semi-dirty city. White water rafting to the east mountains/volcanos in the middle and great surfing/waterfalls/rainforest along the west. Actually rain forest everywhere except for the borth west which gets a little dry. If they get to Dominical, stay at the San Clemente. Mixtos are the non-alcoholic drink of choice.
Be back there myself in Feb.
Oh and tell them to watch out for sloths on the roads- they don't move real quick!
"Hey... lookout! SLOTH!!!!!!!!!!!!"