Отдыхающие то гуляли по пляжу, то спали.

From Lesson 432:Participles as nouns·Russian

Questions & Answers about Отдыхающие то гуляли по пляжу, то спали.

Why does the word отдыхающие look like an adjective but act like the noun 'vacationers'?
This is a substantivized participle. It originally comes from the verb отдыхать (to rest or vacation). The present active participle form is отдыхающий (vacationing). Over time, it started being used as a standalone noun to mean 'the people who are vacationing.'
Since отдыхающие functions as a noun here, how do we decline it in other cases?
Even though it acts as a noun, it keeps its original adjective endings because it is technically a participle. For example, if you wanted to say 'to the vacationers' (dative case), you would use отдыхающим, exactly as you would for a plural adjective.
How exactly does the structure то ..., то ... work here?
This is a repeating conjunction used to describe alternating actions. It translates to 'now [action 1], now [action 2]' or 'one minute they did this, the next they did that.' It tells us the vacationers were frequently switching back and forth between walking and sleeping.
Why use по пляжу (dative) instead of just на пляже (prepositional) to say they walked on the beach?
На пляже indicates a static location. The preposition по followed by the dative case (пляжу) emphasizes movement along or around the surface of a place. It pairs perfectly with verbs of motion like гуляли to specifically mean strolling along the beach.

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