I would pick up the Project, KEEP the Gt for river running, but plan on selling it soon and buying a boat more specific to downriver paddling or creeking.
Eventually pick up a Hero, Villain, Karma, Mamba, Remix, Nomad, Habitat, Recon, Burn, or one of the other modern boats that are at least 8 feet long. Use this boat to progress paddling downriver through more challenging rapids.
The Project 52 should be rad for playboating for some time. Use it to surf waves and paddle easier whitewater (generally class III)