Final answer:
The word 'vacationing' in the sentence 'We saw a baby elephant vacationing in Africa' indicates leisure activities.
Step-by-step explanation:
The main purpose of the word 'vacationing' in the sentence 'We saw a baby elephant vacationing in Africa' is to indicate leisure activities. This word suggests that the baby elephant is taking a break or enjoying its time in Africa. It describes what the elephant was doing at that particular moment.