The Search for Lost Species

No — areas separated by a mountain are not considered adjacent and mountains block placement/adjacency across them (see Rulebook pp8, 24).

Survey by Foot and Survey by Boat are separate actions with different valid target areas and time costs: use Foot for land/adjacent inland areas and Boat for water/coastal routes; each action's rules and time costs are listed with examples (Rulebook p13).

Setting a camera trap is an action that consumes time and lets you check a specific area for animals per the camera trap procedure; follow the placement and resolution steps on Rulebook pp14–15.

Sighting tokens are handled during the Sighting Phase: players report and place sighting tokens, others may view/confirm them, and then tokens are resolved with correct sightings scored and incorrect ones penalized (see Rulebook pp18–20).

No — the rules treat 'truly empty' areas specially and the Lost Species will not be placed in an area that is truly empty; consult the Lost Species / truly empty areas rules for details (Rulebook p9).

Actions move your pawn along the time track according to their time costs; when you reach Expedition Leader spaces you activate or advance your leader as described in the time track and Phase 3 rules (see Rulebook pp10, 16–17).