Hardly needs research Allan! A short 450m stroll on a flat concrete path through the gardens of Newstead Park hardly constitutes a trek! You are provided a map with details of how to get there and when to be back etc 45min before you get off the boat so I am not sure how you got confused about getting to the hotel. Then again some people think that they know everything so why bother reading the detail we have taken time to put together for you. Hardly confusing even without that...walk around the corner and you can see the hotel. Good to see you have managed to incorporate a 3rd party (the most likely happy 70yr olds) into your tale of woe to support your day of misery. We take thousands of seniors on this trip every year and have groups from homes and seniors clubs. Many of these have walkers and mobility issues yet yours is the first complaint of this nature.
I am sorry that you had such a major ordeal and your experience with this trek was too much... we would suggest that you consider eating in rather than venturing out for lunch.