These are all great ideas! Lots of inspiration here.
I like the submerged (possibly crashed) ship. If it is intact, it could belong to the retired Umbaran pirate prince. Maybe it is his getaway ship if the heat comes down on him. If it is a crashed ship… is it older, or more recent? Was it the ship of some Jedi or something? The town has been there awhile, though, so probably nothing tied to the Clone Wars. A lot of possibilities there.
In the second session, they actually had a scuffle along the shore of the lake in which a mound of “devil ants” was discovered.
We just started the campaign recently and we have only had three sessions. The story thus far is that they stole some data on midichlorians from a nearby (couple hours ride on speeder bikes) research facility. The Umbaran pirate prince is pressuring them to go back to the facility and “finish the job” - wipe out all the personnel and blow it up. There is other research going on there besides the midichlorian stuff. Maybe something tied to the lake?
A closed chest or safe could tie in with jen’s suggestion above. Old Sith or Jedi loot might be neat but I hesitate to throw that sort of thing into the game this early on. Connecting back to jen’s suggestion, though, could be a crashed starfighter from long ago. Inside the still-sealed cockpit is the mummified remains of the pilot. The astromech droid is quite deactivated but might have some interesting navigational data still in its memory banks if the PCs could somehow get it. The chest/safe has the pilot’s personal stuff in it. Could be a very interesting datapad in there.
A Gungan warrior whose ultimate goal is to return to Naboo and help free his people from the Imperial work camps, especially his own family. (Hired Gun - Marauder, Enforcer)
A Gotal (former Imperial) scientist who has discovered he is Force-sensitive and is now performing personal research on it. As a scientist, he feel he needs to quantify it all. His faith is science. Breaking into the research facility to begin with was his own mission. (Engineer - Scientist, Force-Sensitive Emergent)
And a human pilot who is involved in the local jet pack racing circuits. His antics have led to him being in debt to the Umbaran pirate. (Scoundrel - Hotshot, Modder)
They collectively have no resources. The first session was just the scientist’s player curious about the system. So he created the character and the adventure grew out of showing him how the dice symbols work. In the second session, the Gungan player joined with his character (re-rolled new) from a brief campaign I ran a few years ago. And in the third session, another friend of mine joined in with the jetpack racer. So they have no group ship or cache of credits to split or anything like that. Maybe what’s in the lake can become that resource.