Как по английски будет: ,,там было очень забавно!"

It was really fun there! It was very cheerfully there! There was a lot of fun! There was a barrel of fun!

там there;

было was;

очень весело really fun, a lot of fun, very cheerfully, a barrel of fun (буквально: бочка веселья), terrific (великолепно, прекрасно).