This is a Plumeria, some call them Frangipani. These are the flowers they use to make Lei's in Hawaii. They come in over 50 colors, but in my little garden I only have 4 colors....about 20 plants, but 4 colors, LOL.
These yellow ones grow the hardiest and largest as far as I can tell, and their fragrance is almost identical to Coppertone suntan lotion...Mmmmm. Nothing says summer like that smell! :)