Hi Dyana! Welcome to the DIS!
If you walk out the main entrance of the Boardwalk, there are usually cabs in the area waiting for folks. If there is not one waiting, the bell captain can call one for you. I believe I paid about $6 to get from the Boardwalk to the CBR, including tip.
I highly recommend Jellyrolls if all members of your group are over 21. It's great fun!
Have a wonderful trip!
Karen