All I can say is tandems are ok for experiencing the freefall and are counted towards your jump numbers, but other than that are not worth much more. So forget about doing tandems (they cost more money too) and sign up for the AFF course. You get to be in control of the skydive and if you like it after level 1 you can go on and do level 2 and so on.
I know I only have 15 jumps (1 being a tandem!), but believe me, after doing AFF I wouldn't go back and do another tandem again. **Moggie Gifts**