From the author's README on Thunderstore

Hey guys! This is my second surf map, and definitely my best one so far!

First of all, I want to apologize for Surf Ski 2. That was literally the worst Reskate map ever made lol. But anyway, putting that aside, I think this one turned out pretty well!

I'd recommend having Forward Boost bound and No Bail enabled to fully enjoy the map and make it through all the sections.

Other than that, I hope you guys enjoy it! :)

Install Surf Boreas

You need ReSkate and your own copy of skate. on Steam.

Open ReSkateLauncher.exe and go to MODS.
Search for Surf Boreas and click install. The launcher also installs anything it depends on.
Press PLAY. In game, the MODS tab of the ReSkate menu (Insert) turns it on and off.

Or install it by hand: download the .zip and drop it on the launcher window, or unzip it into its own folder in Mods\ beside Skate.exe.

Maps show up in the ReSkate menu's level list. To join a server running a custom map, you need the same map installed. If the game won't load after installing, see known issues.

skatemods doesn't host or review this mod. The download comes straight from Thunderstore. Only install mods you trust, because scripts can run code.