I can recommend the Doubletree in Miraflores. Other nice areas to visit are San Isidro, Monterrico. There is a casino on Avenida de las Americas so if that is your type of nightlife you are in luck. If you do not have time to visit other cities I would recommend doing something useful such as seeing a dentist/beauty- and diet treatments which are very cheap. I recently went to an excellent dentist in Miraflores (Munident)where I had 8 root canals and porcelain veneers for $1500.
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KLM PE,HHonors Diamond,SPG Plat,PC Plat,SAS Silver