Manuel: ¿qué te parece ir a este lugar ecoturístico? carlos: ¡ maravilloso ir aquí! será serás serán seremos

The answer would be Sera. In a complete sentence It would sound more logical because the rest count as past tense and in this sentence they are talking about in the present."¿Qué te parece ir a este lugar ecoturístico? Carlos: ¡sera maravilloso ir aquí!"

The correct word to choose to complete the sentence is:

Será.

Carlos: ¡será maravilloso ir aquí!

Explanation:

The sentence tense is future. with this in mind the verb should be in the same tense (future).The verb in this case is: es (be/is).with all those things in mind we can put the verb es in the right tense. The future of es is: será

Bi’m pretty sure i am pretty fluent in spanish so it should be right