american english - combine two sentence into one sentence

I want to combine two sentence into one sentence. But I'm not sure what whether correct or not.

1. I have been honeymoon trip to Hongkong.


2. It was my last trip.

1+2: I have been honeymoon trip (that) was my last trip to HongKong.

Is this correct? Or is there any other options? How about to use 'was' make sentence at #1 instead 'have pp'? I'm not sure what is correct using tense?

How about this for else option, instead #1. 1-1 I did honeymoon trip to Hongkong. 2-1 It was my last trip. 3-1 I did honeymoon trip (that) was my last trip to hongkong.

Answer

Sentence 1 is not correct. It needs "on", or other wording.

I have been on my honeymoon trip to Hong Kong. I was on my honeymoon trip to Honk Kong. I went to Hong Kong on my honeymoon.

Sentence 2 uses "last". Do you mean "latest,most recent", or "last, I will never go again."

Putting the two main sentences together

I have been on my honeymoon which was my latest trip to Hong Kong.

I was on my honeymoon trip to Hong Kong ; it was my last trip. (Fancy semi-colon) On my last trip to Hong Kong I went on my honeymoon. My last trip to Hong Kong was my honeymoon.