Take another look at the sentence:
Danny loved going to the beach. He watched beautiful women in skimpy bikinis, ate fresh seafood, and swum in the refreshing water. After a shark bit his leg, however, Danny preferred the pool at his apartment complex.
Swim is an irregular verb; the chart below shows its forms.
|Verb||Simple Present||Simple Past||Past Participle|
Ate, the verb you chose, is perfectly correct. Before you continue, review the rules for irregular verbs.