Hi Pam,
I'm not really an expert, merely an enthusiast!
Regent only provides dayrooms at the Radisson to those who book Regent Air, but I believe you may be able to pay for this package as an add-on extra if you are independent. Not sure, ask your TA.
For those with this package, you get to stay on the PG until lunch time, then you have the option of going straight to the Radisson , or taking a bus tour, then going to the hotel. The rooms aren't ready until about 3 as I remember, but you can laze around the pool and go for a walk on the beach if you like. You get the room for about 3 hours, enough time for a nap or a shower.
The Regent transport is fine, although I would suggest taking a cab to the airport from the hotel--it's worth the money, especially if you can beat the throng. There's lots of sitting around and waiting otherwise, until everybody is on the bus, you know how it is. It's probably about $30.