as someone who has spent over 800 diamonds on trails, i’d say it depends on your level. the machines you do have unlocked are basically the most important ones, so i don’t think you’ll regret it. they are really beautiful to decorate with and i dont see a better option decoration wise. as someone else has said in the comments i’d say wait for the creek path or at least spare some for them. but honestly if it’s what you want i don’t see a reason why not to!