Do you like sea serpents?
Sea Serpents spawn in the "Ocean" at night or during a storm. If you stay close to shore, you wont get serpents. Just don't get too close to "plains" or skeeter might eat ya.
Daidraco
The Lox breeding is NYI (they wont reproduce), but I imagine it will be for the same reason you want pigs and wolves; that is, to safely farm their mats (since they fuck you up, just like everything in Plains).
For anyone that wants to dial back the time spent traveling and waiting: There is a
MOD that will allow you to transport everything. Additionally, you can manually set the time it takes to ferment and smelt; as well as many other things, like how much wood the charcoal burner holds.
Adebisi
If you would rather not use the cheat-ish mod and are low on cores, it's better to take the mats to build a portal with you at the ore mine base, then go back to main hub, through the portal, disassemble the ore smelter and set it up at the new base (the less cores you take on the boat, the less you lose, if your boat gets sunk). You don't lose anything when you demolish the smelter, so it can just move with you. Once you get to the plains level, you will also need to take 10 iron with you on the boat, to build the better smelter.
Edit: Take 16 copper and 2 bronze to build a forge plus the upgrade items in the new base. Then you can build and upgrade all the stuff that only requires iron at the swamp base and eventually fill your boat with iron to take back to the main hub.