Buongiorno,
You could do some beautiful beaches while you are visiting Cinque Terre & Portofino, have a look at the articles at this link which will give you some ideas of which beaches you might want to visit while in Cinque Terre:
https://www.discovertuscany.com/cinque-terre/
Though if you want to do a beach in Livorno that is great, they don’t really “specialize in sandy beaches” but I have gone there a couple of times (mainly for SCUBA diving) and enjoyed the local flavor. (Bagni Pancaldi in Acquaviva - Viale Italia, 62 - 57127 Livorno) You could also check out visiting the canals in which have given Livorno a reputation of the Venice in Tuscany, maybe with a tour (http://www.livornobyboat.com/).
Buon Viaggio,
Donna Denise
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