Formal:
* Arohanui ki a koe (pronounced: ah-roh-ha-noo-ee kee ah koh-eh) - "Much love to you"
* Tena koe, aroha nui (pronounced: teh-nah koh-eh, ah-roh-ha noo-ee) - "Greetings, much love"
Informal:
* Aroha nui (pronounced: ah-roh-ha noo-ee) - "Much love" (this is a general term for love and affection)
* Aroha ahau ki a koe (pronounced: ah-roh-ha ah-ow kee ah koh-eh) - "I love you" (more personal and intimate)
* Haere mai, aroha (pronounced: hah-eh-reh my, ah-roh-ha) - "Welcome, love" (can be used as a greeting)
You can also use the phrase "Nga mihi aroha" (pronounced: nah-ngah mee-hee ah-roh-ha) which means "Love and greetings." This is a very common way to express love and good wishes in Māori.
Ultimately, the best way to say "much love to" in Māori will depend on the context and your relationship with the person you are speaking to.