Step 1: Understanding the meaning.
The sentence means “We want to do something fun.” In Spanish, the word for “something” in a positive statement is “algo.”
Step 2: Grammar explanation.
“Algo” is an indefinite pronoun used in affirmative sentences to refer to an unspecified object or action.
Example:
- Quiero comer algo. (I want to eat something.)
Similarly:
- Queremos hacer algo divertido.
Step 3: Analysis of options.
- (1) alguno → Means “some” (used with nouns).
- (2) nada → Means “nothing,” used in negative contexts.
- (3) algo → Correct — means “something.”
- (4) nadie → Means “no one.”
Step 4: Conclusion.
Hence, the correct answer is algo.