The answers will have to be fairly subjective because your difficulties in walking and sitting are not too specific but: I would suggest that you look at the tours and how long they are from the ship then decide whether you can last that long or not. They will all have a length of time and an indication as to how easy or hard they are. If you really like any of them you will probably find that there are taxis outside on the quay that will do the same, or longer or shorter at a better price, particularly if there are four of you.
Malaga:- the town is ok but holds little of real interest apart from the Cathedral and some pleasant parks and you are normally docked a long way from the dock gates. So look at the tours...... >>>
Barcelona:- not to be missed, yes a tour would be good but remember the options.......>>>>>
Cannes:- very pleasant for a short walk around but best to pick a cafe and people watch with a coffee and cognac......>>>>
Florence:- is beautiful with so much to see but is a fair distance from the port and to see it properly requires a lot of walking, Pisa might be a better bet as it is closer and there is less walking.....>>>>
Rome: is the same. It would be a shame to miss it and a coach trip might prove to be the best as taxis will be expensive from Civitavecchia and the train might not be suitable for you.....>>>>
Gibraltar:- Great place to visit & a taxi should be a reasonably priced option & you choose what to see...
Lisbon:- You might consider getting the train from the station just up the road and going to Cascais or Estoril for the sea air or taking the shuttle into Lisbon and looking around at the centre. The Castle and the trams might be too difficult for you but the custard tarts are worth having.......>>>>>
Vigo is all hills and might prove a problem for you, I'll leave you to decide on that one.
Wheel chairs are normally available on the ships but a polite inquiry at your cruise line would be advisable. Be sure to mention the fact that you have walking difficulties if you are flying because they will make sure that you are better looked after that way. I hope you enjoy your cruise. Ida
Thankyou very much for taking the time to write about each port, it is very useful, i have looked up the tour options and realise Rome will not be suitable,it is a long trip and would definately be too much ,Cannes sounds good, i'm sure i would enjoy sitting in a cafe people watching, the other places we visit i think a taxi sounds the best bet, it would be nice to maybe share with another couple who have visited before and would have a better incite as to where to go. We're leaving frm Southampton as flying is not suitable for me as i am recovering from back surgery, the main reason we have chosen a cruise is because of the option to leave from UK and hopefully find some sun in June, i am so looking forward to this holiday and hope The Jade is a nice ship, thankyou once again.
I would just like to say what a pleasure it was reading the question, the answer and the comment - Scaling asked, Ida gave an informative reply and Scaling said 'Thank you for sharing your experience'. Well done to you both. I have done Barcelona Hop on Hop Off bus from NCL Gem - the port bus from the ship will drop you off right beside the stop for the HOHO bus, it costs 20 euro and takes in all the sights and in my opinion one of the best value for money of most European citys we have used the HOHO bus in, however it does take 2 hours if you stay on the bus and not get off at all so may not be suitable. Have done the HOHO in Malaga when on a land based holiday and really not that much of note to see - not sure where you would pick this up, but would imagine that there would be a stop close to the port. If the staff on the Jade are half as helpful & friendly as on the Gem you will have a great time. Enjoy.