I can empathise, and I guess we are all aware and want to use this small window of time in our 60’s - when we hopefully have the energy still to travel, before age and diminishing fitness preclude doing some things. I am very much aware of being in a small window of time here.
Your wife is below state pension age, does that affect her thoughts and plans? It has been harsh having a full 6 years added to our working lives.
Could you have a meeting (over a nice pub lunch?) to plan out how you each see your retirement, your futures going forwards, to see exactly how your wife sees her own wishes, plans, desires panning out for the next 5 years?
Has she worked hard raising a family for example, and is now relishing time for herself, relaxing, with fewer commitments?
In answer to your question of travel, for example in some informal friendship groups I meet couples abroad where the lady is happy to spend her days resting, reading and relaxing poolside, where her husband joins us, an informal group of walkers, he spends his days with us - and both are very happy with their arrangement, they each get what they need.
Also, for example, winter sun in the Canaries, have found it very easy as a single traveller in a hotel to meet up casually and informally with lots of other similar-aged people who enjoy walking, the company of others and exploring. I think by going on one solo holiday, you can easily meet others and then it opens further travel and friendship options going forwards.
I would also say, with hindsight, if there is an activity that you love doing, I would urge you not to give up on that, even if you have to continue it alone. My own experience is that it can lead to regret or resentment later on. I loved a particular sport, but abandoned it for 20 years because I felt precluded from going alone. I restarted in my 60’s, I regret the missing years.