Dark lake help
So my players are level 4, there’s a Druid, a Sorcerer and a fighter, and they have all the starting npcs except Buppido and Ront. They just escaped from sloobludop. They rolled to see what boats were at dock I gave it a percentile and they rolled stupidly high so I gave them a Duergar steamboat that the kua-toa somehow got their fins on. The party escaped onto the dark lake and are making a beeline for Mythrill hall. They’re making too good of time. There’s not a lot of land between the shore of the dark lake and the hall and once they make it to the hall they’re basically at the surface and the campaigns over with the party skipping 90% of the module. How can I get them to explore some of the other areas without railroading them? They have meticulously dodged every plot hook I’ve tried to throw their way and I was really hoping to make this adventure last to level 20. Any advice, tips or ideas are welcome.