Advice on keeping a sandbox open with slightly hesitant players

Hey all!

Half of this is a little vent, but also looking for some advice.

My campaign has been running since level 8, and recently hit level 14 (session 72!)

The party decided to head down a tunnel they found in a cave, and so I prepped the next section of the world down the tunnel. Partway down, one of them asked how far down they were and I had them roll survival, which gave them the information that they were likely heading toward the Underdark.

Unexpectedly, they decided that the underdark was too dangerous and immediately turned around. They didn't ask if their characters knew about the dangers of the underdark, they just assumed it was too dangerous and turned around, leaving all that prep behind.

Now they are planning an overland trip across some wilderness to find a manor house they were going to look for in a few sessions time.

I can prep the next bit as well, but they are becoming quite hesitant to explore recently - this is the second time they've doubled back after picking a direction. I usually ask where they're heading next and prep between sessions, so it's a little jarring for me when they change their minds!

I know the answer will be along the lines of "talk to your players, tell them that level 14s should be able to handle the underdark" - like I said, this is half venting.

What do other people do with indecisive players in sandboxes? How do you make your lives easier for prep?

Have multiple things prepared in one area

Quote from ThorukDuckSlayer >>

How do you make your lives easier for prep?

I prep a few alternatives, which all lead into the same place eventually. It might not be during the same session, but.. eventually. And then I try to give them a personal reason to choose a specific path, so that the characters feel the need to continue on their chosen path or something worse will happen. If it's a few days travel and then they decide to do a 180, then it's another few days back. That's already a week lost for nothing and the bad guys are not sitting idly waiting for the party to make decision. Even if I don't have anything planned for such an event, I hint at the possibility, which usually gives the party enough determination to going through their original plan.

The real answer is that indecisive players are a poor fit for sandboxes. They work better in a more structured campaign.

I don't have a lot of great advice, because my group has relatively short sessions, so I can improvise on the spot, then prep (inasmuch as I prep) before the next session.

One thing you might try is, once they choose a direction, just jump to the destination. If they decide to go down a tunnel to the underdark, is there any good reason to play through the tunnel, instead of cutting to where they come out of the other end? If they're prone to backing out in transit, skip the transit.

I agree with the OP that the answer is talk to your players, but not to tell them they’re level 14 so they’ll be fine.

Instead, you lay on the guilt. You play up the social contract inherent in the game. Explain that when they decide where to go, you put a lot of time and energy into prep for that. When they later decide to double back, they’ve now really wasted your time. Not to say they shouldn’t ever, particularly if new information comes to light, but the baseline should be them sticking to their plan.

I’d think after 72 sessions, you should have earned enough trust that whatever they face may be dangerous, but it will also an appropriate challenge. Characters may die no matter where they go, but you’re not out to get them.

Of course, the other tip is on your end don’t plan more than 1 session in advance. Maybe you have a vague idea of what’s going on 2 or 3 or 5 sessions down the line, but only do the real prep for one. 
Also, if you don’t already do this, always end the session with a discussion of what they’ll do next. Even if it’s an above table discussion, it can really help cement the plan.

For my prep, I have a sheet of various ideas for the areas they currently are in and for plot points that I can flesh out. When I need something new, I look at my sheet and quickly find something to make. It actually works pretty well to have all your options on paper for a quick prep reference.