Make sure you get a " Montecatini Card" They are FREE.  To get one , try the Travel Company rep but you can probably get them at the Tourist Information office or even the hotel. They entitle you to discounts at lots of places:

Teccucci spa. -  For access as a "visitor" that is just to look at the lovely architecture, and gardens after 11am Using a Montecatini card it cost 3Euro instead of 6Euro. 

It can also be used it on the Funicular, the little town train and in many restaurants, cafes and shops to get discounts too .