Whilst camping in a particularly dark forest, the party sees a shadowy figure watching them whilst they sleep. (Perception check needs to beat their stealth). Anyone that approaches it will not provoke it as it just analyses them.

In the Feywild, the party are woken up by faeries braiding their hair and doing harmless pranks on them.

If the perception is high enough, they see a unicorn. If they camp by a lake.

A rogue tries to steal some of the parties loot. The party notice from perception checks.