Hiking/Kayak/Water Parks:
If you like nature trails spend the day going thru the rain forest (El Yunque). The entire family will enjoy this. You will find water falls with swimming holes to refresh yourself.
There is a natural reserve a few minutes south that you can go kayaking in the Humacao Wildlife Refuge.
The Ceiba Forest is just a few minutes north and has mangrooves and manatees.
There is a family water park in Salinas (Parque Olympico) which is approx 30 min south.
Golf:
Like golfing? There are two great golf courses nearby. El Conquistador in Fajardo is just 10-15 min north on Route 3 and it has a great course. Palmas De Mar in Humacao is a few miles south with another great course.
Beaches /Islands:
Cala de Hucares is a beachfront community and has access to its own beach. But if you prefer more activity there are several beautiful beaches nearby. To the north is Luquillo Beach which is great and offers horseback riding. Just a few minutes south is Punta Santiago in Humacao with a small water park.
There are ferries that depart from Fajardo that will take you to 2 beautiful islands (Vieques, Culebra) where you can spend a day and have fun snorkeling, scuba diving or swimming.
Other Activities:
hiking, kayaking