If walking, running or cycling around Rarotonga is not enough there are a couple of gyms on Rarotonga.
Rarotonga Golf Club (ph: 20621) is located in Nikao, near Black Rock. It is a 9 hole golf course. The club is open 6 days a week with hours for non-club members being Monday-Friday 8am -2pm
You can hire golf clubs for NZ$20 and green fees are NZ$15
Tennis courts in Nikao close to the Golf Club