I'd be an orca. They have tight-knit families/communities, so you always have good company. You don't have to worry about sharks coming after you, and you get to travel the world. Being able to jump out of water so gracefully is a bonus. I also LOVE seafood!
Either that or crows/ravens...kinda torn between the gorgeous ocean world or being a smart bird with few predators.
Totally not original, but I'd be a house cat. My cats just seem to love life and I too want to just lay around, kill bugs, and annoy people into giving me attention.
Octopus because it has three hearts which is i can use to love more than just one and has 8 arms that i can use to hugged many people i cared when it is cut it can regrow back again.