Costa Rica is a fabulous country, diverse in terrain, climate and wildlife. It has one of the highest literacy rates in the world, one of the oldest democracies south of the United States border, no standing army - and very good salsa dancers. A smile goes further here than almost anywhere else in the world. You should expect to meet wonderful, friendly Costa Ricans called Ticos/Ticas. They are a gentle people, sometimes a bit shy until you look them in the eye and smile. They are not to be feared as thieves or rip-off artists, and unlike other Latin American countries, Ticos rarely bargain over prices but may give you a discount for payment in cash.
Costa Ricans are a soft spoken yet prideful people, who love children. They shake hands when meeting you, as do their children. They expect you and yours to do the same. Once Ticos are past infancy they do not lose their temper in public. Pura Vida, right? Hence, the only way to really not get ahead in this country, make a fool of yourself, and guarantee to not get what you want, is to lose yours. On the other hand, when you smile, lighten up a situation, try to crack a joke, they will go to any extreme to help you out. They are a genuine people, and appreciate connecting with you on the same level.
If you are traveling with young children, especially toddlers, consider for a moment that the Osa is a jungle: a wild and remote place with all sorts of flora and fauna, often beautiful and intriguing but at the same time dangerous. The beach is gorgeous and generally family friendly but is also an ocean, inviting but unpredictable. There is no life guard or other beach supervision. Moreover, Costa Rica doesn't have much in the way of building codes or other safety concerns - nor legal concerns. Few know what a child car seat is, and you definitely will not find buildings outfitted to protect little ones, such as balcony railings that kids can't climb or fall through. If you decide to bring your Little Ones, plan to keep your eyes on them. Pura Vida.