Aloha: hoʻokamahaʻo la e makahiki [ho oh-ka-ma-ha O la A ma-ka-hee-kee]
Happy birthday cousin tina have a wonderful day
Mele Kalikimaka me ka Hau'oli Makahiki Hou
To say "this year was challenging" in Hawaiian, you can say "he makemake ikaika kēia makahiki."
To say "Have a great day" in Hawaiian, you would say "Maikaʻi ka lā."
You can say "Hau'oli La Ku'oko'a" which means Happy Independence Day in Hawaiian.
The sentence structure is a bit awkward. It would be better to say, "Have a wonderful day ahead" or "I hope you have a wonderful day ahead."
La with a kahakou over the a.
To say "have a good day" in Hawaiian, you can say "Maluhia maika'i o kākou."
Je vous souhaite une mercveilleuse annee - i hope you have a wonderful year
Enjoy and celebrate your special day
J'esp
In Hawaiian, "one day" is translated as "ka lākou mua," and "someday" is translated as "ka lā hiki mai."