I came across this sentence: 船に乗るのは二回目だ
It was an example sentence in a Japanese children's book for learning Kanji, so there's not any context. Because of 目 I took it to mean "this is the second time that I ride a boat."
How could I switch the subject around to say "I'm riding a boat for the second time."? I would guess: 今、二回目に船に乗っている. Is it correct to use 二回目に as an adverb "for the second time" or is there any other (more natural/common) way?