Hey I have a little suggestion, differents materials for the string hanging the lights.
Not specially different colour, that would be ugly, (or white) but I mean a rope texture (brown) for boats for example .

Thanks for the suggestion! I have wanted to do rope, but it has be delayed as it requires changes to rendering for a nice textured appearance.

Alongside the rope strings idea, it'd also be nice to consider having plain (no lights attached) ropes, chains, strings, etc. The slack line aesthetic is really cool!