Ok
i'm going to start a neverwinter campaign and i want it with some features:

pg starting from lvl 5
it should be a "free roaming" adventure with a general mainplot:

i'll let the party start on a ship going to neverwinter
then a shipwreck or sea monster attack
one of the passengers or hidden in one crate they should get a crystal and an ancient dwarven signet

the idea is that the crystal is essential to repair the Mythrallar of Xinlenal the ancient lost flying city hidden somewhere in the woods


during the adventure they should learn they need to discover the lost library of Gauntlgrym to get an hint of xinlenal whereabouts and then get there and fulfill their destiny



i haven't planned each encounter and i won't i'd like to let them focus in what they want
monster hunting
spying
robbing
bookworming


i'm even willing to change the entire plot if they want to get involved in something different!

what i need?

you could suggest me light spots, funny events, intriguing hints and hooks, the more open ended the better!