It might be good to think if there is somewhere that you have always wanted to visit, but not got round to yet. Then see if that is a practical possibility , given state of health etc. We never know when life changes and we perhaps cant manage to do as much as we could. This way, at least, you have enjoyed that special place and will have good memories to look back on, rather than regrets of never getting there.
Do you both enjoy the same thing, or might you have some hobby that you do alone and enjoy going to a few days workshop individually and then going to your favourite place together at another time.? There just might be specific one off things that you might like to accomplish, such as a glider flight or balloon flight, while you feel able to enjoy it, and you might be able to go to your favourite place and find something like that to try while you are there. Nothing gets any cheaper, and so I think it is worth going for something that is special, while you can. Again great memories.
I went to Glyndebourne many years ago, and it was an expensive treat at the time, and I was working then. I was a singer and my mother had sung all her life but never been there, so I gave her a ticket as a birthday present. Now many years later , I cant even remember what I paid for the tickets, but still have the old programme of wonderful Cosi fan Tutti, with great singers . We did the lot, went with friends , dressed up and took our picnic etc. It is still one of the standout memories of my life and an so glad that we did it I have only to look at that programme and it brings back such great memories of the day and my mum etc etc., so whether it is a day at the races, or a trip to an art gallery , whatever floats your boat will give you a happy day and wonderful things to look back on. Enjoy whatever you can