Lil Wayne -- All Smiles with Son ... Days Before Seizure Attacks

Lil Wayne was the picture of good health while exploring an Atlanta aquarium with his son last weekend -- this just three days before suffering a slew of seizures that left him hospitalized in L.A.

The pics were snapped at the Georgia Aquarium on March 9. Wayne was there with his 4-year-old son, Dwayne Carter III, checking out the Ocean Voyager exhibit.

Sources on scene tell us ... the rapper was having a blast with his lil guy and kept pointing the fishes out to his son. We're told Wayne even took time to talk to fans before taking in the dolphin show later that evening.

Sadly, the happy excursion ended up a far cry from the rest of Wayne's week. TMZ broke the story ... Wayne was hospitalized in L.A. Tuesday night after suffering multiple seizures. After a short release, he was re-admitted Wednesday to the ICU -- after one of his body guards found him unconscious on the floor.