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

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 (потрясающе, великолепно).