Forget about the raft (Well, maybe for short trips.) They are VERY slow and a long trip will get VERY boring (if you're lucky). Work on finding more Burial Chambers, getting more surtling cores and metal ore, making better armor and weapons. Along that line you will get the recipe for a decent boat which you will probably need to get to the next boss. Give any other biomes beyond meadows and black florist a wide berth. You're not ready and it's depressing to lose your stuff where you can't retrieve it.