If we're going on vacation in Guam, I think three nights would be more than enough to see the sights.
Guam is a small island, so if you spend three nights there, that's enough time to enjoy yourself.
ーIf we're going on vacation in Guam, I think three nights would be more than enough to see the sights.
「グアムに旅行に行くなら、観光するのに３泊すれば十分だと思うよ」
to go on vacation で「旅行に行く・休暇に出かける」
to see the sights で「観光する」
ーGuam is a small island, so if you spend three nights there, that's enough time to enjoy yourself.
「グアムは小さい島なので、そこで３泊過ごせば楽しむのに十分です」
small island で「小さい島」
to spend three nights で「３泊過ごす」
to enjoy oneself で「楽しむ・遊ぶ」
ご参考まで！
Guam is a small island, so you can enjoy the whole place with about three nights of stay.
Around three nights for a trip to Guam would be enough, because it's a small island.
ご質問ありがとうございます。
① "Guam is a small island,"＝「グアムは小さい島です」
"so you can enjoy the whole place with about three nights of stay."＝「なので、三泊ほどで全部楽しむことができます。」
② "Around three nights for a trip to Guam would be enough,"＝「グアム旅行は3泊ほどが十分です」
"because it's a small island."＝「小さな島なので。」
ご参考に。
Three nights is enough time to enjoy a vacation in Guam.
以下のように表現することができます。
You can enjoy Guam if you stay for three nights.
三泊すればグアムを楽しむことができます。
Three nights is enough time to enjoy a vacation in Guam.
グアム旅行を楽しむのに三泊あれば十分です。
enough time で「十分な時間」を英語で表現することができます。
お役に立てれば嬉しいです。
またいつでも質問してください。
カナダ 
アメリカ合衆国 
