RCTgo

Installation:

First, you need the appropriate custom content packs. Download and install these files as instructed in the readme text files:

Cinapaes Boomerang CT
Maylene's Classic Corkscrew
Belgabor's Invisible Doodads
CoasterJoe queue lines
SK Canopy101
Shyguy's Planters
Shyguy's Waterworld
Briantjuh94's Path Covers 2
CTR's Paths 1 Redux
CTR's Paths 2
StationJim's random things
Station Jim's Fencing
Station Jim's Gardening
Station Jim's Gardening 2
Station Jim's Gardening 2.5
JMAinAZ Mist Fans
JMAinAZ Recolorable Fans
Moby's Curved Walls & Floors
Moby's Glasshouse & Frameworx

Once you have downloaded all the required custom content, you need to download the actual track. Get it here.

Place the .trk file in Documents/RCT3/Coasters.

If you installed everything correctly, you should be able to find "CTR Vekoma Boomerang CT" in your list of coasters. Find it and click on the little folder in the corner of the list item. Select the track "Boomerang" and wait for it to load. Place wherever you want and enjoy! I would suggest recoloring items to match your liking and replacing common park items like trash cans to match the ones you already have in your park. When placing paths, keep in mind the queue and the exit do not play nice with them. Use invisible paths and match it up the best you can. Set the queue line fences to invisible as well. It will look perfectly normal but peeps will float and walk through fences.

Pictures: