First sea pretty much boring but it has Greybeard! Thats pretty fire. For 2nd sea you can do fruits awakening like Buddha , Dough , Quake , Spider ,Flame ,Ice , Light , Rumble , Dark , Magma , Pheonix and Sand . Then there is a sea event where Sea Beast spawns every 15min for ...
red, blue and yellow. you get the red flower at some specific spots in the second sea, only in the morning. similarly for the blue flower, but it only spawns at night. the yellow flower can be obtained by killing npc, which takes a bit longer. after that, talk to the alchemist ...