"We can have a lot of fun" in Spanish is "Podemos divertirnos mucho". It is pronounced "po-DAY-mose dee-bare-TEER-nos MOO-cho". Please see the Related link below for confirmation of the translation.
It will be fun - será diversión
Te has disfrutado = Did you have fun
I have fun with you: Me divierto contigo.
divertir
If Mexican is just Spanish then have fun! is : ¡diviértase!
Fue Divertido
¡Fue divertido/a!
Burlar
Nos divertimos.
"Divertido" or "Diversión"
'a lot' in Spanish is 'mucho'
"Join the fun, learn spanish" would be: ' Únete a la diversión, aprende español'