For this port what you decide to do will depend on how adventurous you are.
Greenock is your Port of Call. The Ocean Terminal has a tourist centre with plenty of maps, leaflets and lots of information about the surrounding area. They will let you know bus timings to Glasgow and where to catch the bus. They will point you in the direction of the train station if you are so inclined. Also in the terminal are small stalls/shops selling local ware. Look out for the dancing Scotsman as you sail into the Terminal, and have your camera ready.
You can remain in port, as you get off the ship there is a desk where they do 3 local excursions free of charge (donations only). The choice you have is: Gourock Tour, Greenock Tour or Port Glasgow and Newark Castle Tour. Note that for that last tour although the tour is free, entry to the castle requires a small entry fee. You need to book as you get off, only 30 passengers are on the minibus.
Greenock itself has some nice places to visit, try the McLean Museum and Art Gallery. Taxis are readily available at the dock they do tours of/to Largs, Loch Lomond Shores where you can shop in Jenners, eat in the Highland Skirley, Helensburgh, tour of Loch Lomond etc.
The other thing on offer is a taxi tour at £30 per hour. Other things on offer, you can pick up a map for town walking routes and there are buses going to Loch Lomond where there are waterbus trips on the Loch itself.
Then further afield in and around Inverclyde (the authority area of Greenock, Port Glasgow and Gourock) there is plenty to do. You could take a bus or train just along the coast to Gourock. This is a lovely place for a walk with a couple of decent eateries and great views if you wish to climb a bit. Try the ferry across to Dunoon. This is worth a short visit on a nice day. Another trip is to the Isle of Bute (from Wemyss Bay). Or visit the Loch Lomond area.
However, the port in Greenock is the gateway into Glasgow. A taxi to Glasgow is £40, we over heard the price and I suspect that this is a single. There are lots of taxis outside the terminal. The train takes between 45 – 55 mins depending on which one you catch. There are two stations in Greenock. Greenock West is up a hill, Greenock Central is much easier to reach from the Cruise Terminal. It takes about 40 minutes and there are 2 to3 trains per hour, around £7, (2014) off peak return.
The HoHo city bus tour is around £11 but is good; you can go round the full loop for an overview of the city then stop off at the points that interest you. But, read up on Glasgow because the bus will not take you everywhere.
There is the Kelvingrove art gallery and museum, Princes square shopping centre, Macintosh willow tea rooms, Buchannan street precinct
By Peter Dagnall