Suppose that I'm a druid, and I Wildshape into the form of a medium earth elemental (functionally the same as casting Elemental Body II). What senses do I have available to me?
Polymorph spells have a few restrictions:
Each polymorph spell can grant you a number of other benefits, including movement types, resistances, and senses. If the form you choose grants these benefits, or a greater ability of the same type, you gain the listed benefit. If the form grants a lesser ability of the same type, you gain the lesser ability instead. Your base speed changes to match that of the form you assume. If the form grants a swim or burrow speed, you maintain the ability to breathe if you are swimming or burrowing.
While under the effects of a polymorph spell, you lose all extraordinary and supernatural abilities that depend on your original form (such as keen senses, scent, and darkvision).[...] While most of these should be obvious, the GM is the final arbiter of what abilities depend on form and are lost when a new form is assumed. Your new form might restore a number of these abilities if they are possessed by the new form.
Elemental Body explicitly says that shifting into an earth elemental grants:
You also gain darkvision 60 feet and the ability to earth glide.
I have darkvision out to 60 feet (allowed by Elemental Body).
I assume I can see normally beyond 60 feet, because I would assume an earth elemental could.
Do I get tremorsense? Presumably not, because senses are called out in the description of polymorph spells, and Elemental Body does not grant it.
If I don't have tremorsense, how does earth gliding (a variant of burrowing) work?
If I earth glide for a couple rounds, am I still aware of the locations of other combatants? Particularly if they've moved since I submerged myself?
If I'm earth gliding, and there's a room in front of me, when do I become aware of it? 100 feet? 60 feet? Five feet? When I pop out of the wall?
Am I ever aware of room above or below me?
Am I ever aware of inhabitants of these rooms while still burrowed?