Another Newby Question - Spa Offerings on Muse?

[elmaexec]

I'm wondering if use of the steam room, sauna, and whirlpool in the spa is free of charge.  From what I've seen it appears the steam room and sauna may be available FOC, but I can't find any reference to that big whirlpool located behind the Thermal Suite.  Also, to use these facilities if they are offered free, can one simply show up?  It doesn't require reserving a time or anything like that, does it?