Let's Play Minecraft Hardcore Once More 29: Exploring by Sea
The sea is the safest place to explore no matter what time of day it is. While it's not the most interesting part to uncover on a map it's often quick and easy to do. No monsters spawn on the surface of the water and with the exception of the underwater strongholds (which as far as I gather you won't have a problem with if you stay on the surface) you won't have any danger as long as you avoid going too close to the shore and ramming your boat into squid.
You'd be surprised how often someone can manage to ram their boat into squid.
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At this time, Kikoskia has 1,910,095 views for Minecraft spread across 208 videos. There's over 3 days worth of watchable video for Minecraft published on his channel, roughly 1.36% of the content that Kikoskia has uploaded to YouTube.