What's the most interesting way to learn English?

What's the most interesting way to learn English?

“Learning is a treasure that will follow its owner everywhere.” 

What I can tell from experience is that speaking in English is just like anything else. It gets better with practice.

I joined an English speaking academy recently and I forced myself to speak English on a regular basis. Within a month the results were amazing. You see yourself growing, and that changes your fear and nervousness into enthusiasm.

I'd strongly suggest you join an English speaking academy. If it's not possible to make time for it, you could do the following :
(Do it nevertheless) ;)

1) Think in English. (Very important)
2) Talk to yourself in English whilst standing before a mirror. (I've tried it, it helps a lot)
3) Read published matter in English that interests you.
4) Watch television content that is in English.
5) Make a grammar notebook. Write everything new and noteworthy to you about English. Keep going through regularly.