I stressed over this same question back in November and it was all for naught. I looked at renting a car for a day, taxi, mears, etc. and didn't need to worry about it at all.
We were at POP, my SIL and fam were at AOA. They walked over to POP, we told the CM out front we needed a taxi and he called a van over. Simple as that. We had 7 people. With tip I think it was $30 so each family paid $15 to get there.
When we were ready to leave SW at 9pm that night we went out to the parking lot and followed the sign that said Taxis and did the same thing. There was a van readily available and we paid the same thing.
Simple as that, I was ticked that I stressed out about it for so long and it turned out to be so easy and stress free LOL!