The big trip later this year

Some time ago I mentioned about a long complicated trip I wanted to do whilst I could this year. It started with wanting to do a trip with my son to belatedly celebrate his fortieth birthday, when he said he would like to visit the Grand Canyon. This should of happened a couple of years ago but for my health problems, but they made me realise that this was a chance to fulfil some of the places on my Bucket List as well.
So on investigation it seemed we would have to travel to Las Vegas to do this, which suited me because although not a gambler I had always wondered what it was really like,  plus the shows and the Strip intrigued me. Son was only able to have a number of days holiday, plus it needed to be towards the end of the year.
I decided if I was going to do a trip such as this why not do a little more whilst away, so the plan for the big adventure started, I then thought well why not stop off at New York on the way, because previously I had not managed to see all the places I wanted and for reasons I cannot explain I had always wanted to travel on Staten Island Ferry and see the Statue of Liberty close up. I contacted son and asked would he like to add this to the trip, he did not seem to need much encouragement to do this also, so now we had two destinations.

When I looked at Google maps I thought maybe it would be a good time to travel further, so considered Hawaii and a visit to my friend Sofi, who had met up with me over here some years ago. I e mailed her a number of times but have heard nothing, so decided to cancel that but to continue the trip to Australia,  somewhere I had planned to return to many years ago but not got to again so far.
I thought about this and decided again on my list I would like to visit Sydney,  Ayres Rock and maybe the Great Barrier Reef, I then had another look at maps and decided I could indulge myself elsewhere and visit my friend in Penang which I had wanted to do for a number of years, also to see the Christmas Lights in Singapore,  which again had been on my list for many years after a brief trip there back in the 1990s when they were starting to put them up.
WOW this was going to be some trip, but I had realised if I did not do it soon, my health age and travel insurance costs, may prevent me from carrying it out, at this time I had not planned a particular length of time for the trip or a budget, so decided to contact my friendly travel agent Sue and talk it through with her as I did not think I could visit the places I wanted with conventional tours. She came to visit me and gathered information on duration of visits and the path I intended to take and went off to explore options for the trip, it now lookef as though it was on.
When I had time to reflect I thought that there were a few negatives for the trip, firstly, after my son went home I would be on my own with no travelling companion to share the experiences with.But previously when I had hoped to do it with someone special it had fallen through, so maybe doing on my own and seeing who I met on the way would add to the experience, the other things I have had to consider relate to my health, firstly how will my back and pelvis cope with all this travelling, also as I now wear hearing aids it maymake it harder to hear and fully experience some thongs, plus it may make me more vulnerable ad a lone traveller