From the author's README on Thunderstore

Rooftop City – Super Mega Ultra Park

A huge skatepark built on the rooftops of a night-time city, made for ReSkate.

Features

Big plaza with a bowl (volcano-style craters) and a street park section
Skyscraper towers (T1 to T6) with rooftop spots, kickers and landing ramps
Loops, vert ramps, tunnels and transfers connecting the roofs
Night atmosphere: street lights, building lights, tunnel lights
Graffiti and ReSkate tags on walls, floors and roofs (ride over the roof tags, no collision)
Trees, dandelions, roads and ambient city life

Installation

Install with Thunderstore Mod Manager, or unzip the package into your ReSkate Mods folder.

Notes

This is a work in progress. Feedback and bug reports are welcome.
Made with Blender and ReSkate Studio.

Credits

Map and layout: unratedshred
Downtown City MegaKit, Kenney city kits, Poly Haven (CC0) textures and assets

Install rooftop megapark

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

Open ReSkateLauncher.exe and go to MODS.
Search for rooftop megapark 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.