Edge,
I've only made one trip myself (but going back in Dec.) so I can't help you on your questions about the Flipper. But I stayed at the RG and can help a little on that score.
The RG is very nice, clean, big, and comfortable. Your right that they don't ask for ID's but that's not to say that you couldn't stop by the desk on the way in and have your lady drop it off with the desk.
My biggest problem with the RG was the distance from the action but then again that was one of the things that I liked about it too. You can go to the bars and have your fun but when it's time to settle in for the night it's kinda of nice to get away from the action and have some place that's quiet.
You will also run into some other FLB's while at RG which allows you to strike up some nice friendships and "learn from the vet's".
As far as getting around, I'd think twice before renting a motorbike. Hell I'd think twice before getting on the back of one that is offering a taxi service. On your first trip stick to the baht buses. They run right outside the door of the RG about every 3 minutes, cost 10 baht, and can have you in the hot spots in just a couple of minutes. I think it's a little bit to far to walk but for 10 baht (25 cents US) why bother...
Enjoy,
Shilo