Thank you all for the responses. I admit this really is tough.
When I had the idea for a trip as his birthday gift, I knew our relationship was practically non-existant and had no future. Still, I like him and thought he deserved something special for his milestone birthday.
Things are rough now but progress is being made and there's still a lot of time left for further discussion. I am confident that this trip -- as an escape from all the stress and hell of home and work -- will be an opportunity for a new beginning, to enjoy each other's company (if we want to) in a new way.
There are worse things than a cruise to Bermuda...
We are all in the gutter, but some of us are looking at the stars.
~ Oscar Wilde