How to say "take care" in mandarin?

[keen zealot]

context: there is someone i know that is going to have a travel abroad, he said to me 再见 but i am not sure how to reply it

would you guys share me the words that you'll prolly use in this kind of situation?

thx!

[storm raft]

if its a plane trip maybe 一路平安

[frozen agate]

You can simply reply 再見, or you can say 一路順風 which can mean "hope your trip goes smoothly"
祝你旅途愉快 also works

[deep pilot]

路上小心

[keen zealot]

thx guys, appreciate it

[rancid trellis]

保重啊