A quite common issue for paths on the mainland is that the ground is sunk so low that the path just touches the water level. This makes the water waves bleed through the path, which does not look very good. This is unfortunately not easy to spot in the Construction Set (although sometimes possible while shifting the viewing angle), but is clearly visible in the local map in game. I suggest rising the overall ground level slightly in affected areas to fix this issue. I have found this at the following places:

• In Molagreahd Region (24, 5).
• In Alt Orethan Region (19, -21), just north of the manor.
• In Lan Orethan Region (31, -20) close to the farm shacks.
• Around Nedothril Region (37, -23), close to the bridge, although I am not completely sure where (I will update this if I find the exact coordinates).