It means I go to a restaurant.
"Juan voy al restaurante ¿y usted?" means "Juan, I'm going to the restaurant. And you?"
Voy a comprar un boleto de Ida y
un helado de chocolate
It's asking you where you go on your weekends. To respond, you could begin with "El fin de semana (this weekend) voy..." and finish with al cine (the movies), al parque (the park), etc. You could also give a more general answer for what you do on weekends in general: "Los fines de semana (on weekends) voy..." ending with al parque, al cine, etc., or perhaps a la iglesia (to church), or a un restaurante (to a restaurant).
Me voy a comer would be the best way to "I am going to eat" in Spanish.
Voy a un restaurante.
"Juan voy al restaurante ¿y usted?" means "Juan, I'm going to the restaurant. And you?"
It means "in a restaurant".
Voy a comprar un boleto de Ida y
It means "a good restaurant."
ellos estan en un restaurante
The term "voy a", or more generally "ir a", would be followed by a vowell. Example: "Voy a ir al resturante", "I am going to go to the restaurant". You could leave out the verb and just say "Voy al restaurante", or "I go to the restaurant". The first implies future action in the near term. The second is for present condition.
un helado de chocolate
As to know if this for sale a restaurant
por
Voy a hacer un viaje a Perú. Voy a estar en la capital, Lima por ocho días.I'll make a trip to Peru. I will be in the capital Lima for eight days.Answer:por
Me monto un toro Me montaré / me voy a montar un toro.