1st Time w Kids

We have three full days with two travel days on either side Feb 5 - 9. I'm trying to decide between a resort and chill vacation or a more adventurous plan. Right now we're staying at Royal Sonesta San Juan. We'd like to be right on the beach. I'm wondering for our first time maybe just resort and chill in San Juan? If it were just me and the wife I'd rent a car and head east - but with two kids I think just chill.