If you don't know the kanji, never trust the computer to pick the right one for you. That 戦 has to do with matters related to war.
りょこう, not りよこう. Notice the difference in the size and position of the よ. If you don't know the significance of this, go back and review as it is a very essential point to be aware of.
And りょこう takes the verb する, so りょこうしました would be a better fit for your first sentence.
"On my last trip to Japan...." would be 最後日本に行った時....(さいごにほんにいったとき)
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