Learn Spanish (Spain): ¡Qué atracción más alucinante!

Yes, you can! In exclamations that follow the pattern ¡Qué! + noun + adjective, más and tan do the exact same job of amplifying the adjective. You can say ¡Qué atracción más alucinante! or ¡Qué atracción tan alucinante! and both translate naturally as "What an amazing ride!"

Why is there no word for "a" (like una) in the Spanish sentence?

In English, we say "What a ride!" but Spanish doesn't use indefinite articles (un or una) after ¡Qué! in this type of exclamation. The word ¡Qué! attaches directly to the noun.

Is atracción the normal word for an amusement park "ride"?

Exactly. While atracción translates literally to "attraction," in Spain it is the standard word used for rides at a theme park, fair, or carnival. For instance, a rollercoaster or a Ferris wheel are both called atracciones.

Since atracción is a feminine noun, shouldn't alucinante end in an "a"?

No, because alucinante ends in an "-e". Spanish adjectives that end in -e (like alucinante, grande, inteligente) are gender-neutral. They keep the exact same form for both masculine and feminine nouns, though you would still add an -s if the noun were plural.