Costa Rica sounds like a fun place to go.  The major cities of Costa Rica are San Jose, Alajuela, Cartago, Heredia, Liberia, Lion and Puntarenas.  The site has many ideas to help when you travel to all these cities. When going there first consider your budget. I am always on a fixed budget so I would check out the all-exclusive resorts. This means that everything is included, from meals, soft drinks and some alcoholic drinks and entertainment. That sounds like something I would like. Check out the resorts there if you have a family, or if you are single. Check out the location to where the things are that you would like to do while you are in Costa Rica. Check out the site 
http://www.ileisuretravel.com/2009/02/16/costa-rica-resorts.html