Your original sentence is almost correct but can be improved slightly for better clarity and grammar.
Here is the corrected version:
"A forest is where quick squirrels collect nuts and mushrooms, where wolves howl at night, and where bears roam looking for honey."
Explanation:
- Added "A" at the beginning to specify that you are talking about a forest in general.
- Added a comma after "mushrooms" for proper separation in the list.
- Added a comma before "and" to connect the last two clauses clearly.
This makes the sentence clearer and grammatically correct.