San Francisco, Panama City is one of the best part of the city to live in if you are into outdoor activities. I lived on Parque Omar for a year and a half. Parque Omar offers an olympic size pool, a 3.5 kilometer trail around the whole park, outdoor fitness area, gym, covered workout area, basketball courts and tennis court.
The best times to go are in the early morning or in the evening when it is cool. Parque Omar is very popular so just know that it sometimes gets pretty crowded at peak hours. The park is dog friendly so feel free to bring your pet.
During Christmas the park transforms into a green winter wonderland so be prepared for little tykes to be running all over.
Parque Omar is also staffed with a Presidential Police unit so feel confident of your security. My wife is from the San Francisco area and has never had an issue.