Hello,
I have experience in from scratch development of Android application,
including ones with sophisticated functionality and UI design, you can view one of my work at:
http://www.amazon.com/Denis-Manyukhin-Touch-Light-Trial/dp/B00RC4ODV4/ref=sr_1_36?s=mobile-apps&ie=UTF8&qid=1444143269&sr=1-36&keywords=touch+light
As I understood you need offline app that will be touristic guide for Costa Rica where users will be able to find interesting information about Costa Rica and locations where they can find it
Please advise, I will be happy to help you, looking forward to hear from you
Best regards,
Denis