Hi Kerri,
My partner went on this holiday in May.
She thoughly enjoyed it and went on a number of excurions and said that the hotel/resort was excellent.also.
One excursion was the boat trip and that I think would be suitable for you with a walking stick. You do not have to stay in the resort, there is a regular boat service to the nearest town. The fare is only 2 Euros.
The resort also puts on a number of activities, some possibly are not for you like tennis maybe. She did not like the horse riding in the rain.
If you look down the testimonials for Halidiki in this section you will find a couple for this resort / holiday.
My partner said she would go back again
Have a loverly holiday if you decide to go.
Eric