Pisa from Livorno is very easy to do yourself, it's just a short bus ride from the City centre, tickets available from the tourist office. All busses and coaches go to the same car park anyway.
Genoa, you can go to Portofino or just walk to the City centre. Genoa centre is amazing, head to the Fountain de Ferrari then up the Via de Garibaldi, the whole street is world heritage site due to the amazing Villas. Then stop for ice cream at the harbour on the walk back, best ice cream ever according to my kids. 🙂