The best way of getting this free is to save up Gollum's Tokens and use them on 'Premium Chance' where the prizes are better. This requires 6 tokens to play, you can cut the wait to 3 days instead of 6 days by getting the free extra token which is available daily. There is also a chance playing 'Premium Chance' that you could win some hobbit building crews or training runes which can be used to level your hero.
Perform the following once a day to get an extra Gollum token. Select the 'Share' icon at the bottom of the page and click 'email'. When prompted whether you want email or gmail click 'gmail'. You will then be taken to your message drafts in your email where you then click the 'Save to Drafts' option. This will then take you back to the screen you arrived at after you selected the 'Share' icon. Repeat this process 10 times to get the extra token.
Type (witout the quotes) the following phrases in 'Global' or 'Aliance' chat to change the weather to the corresponding. Once the phrase has been posted simply exit the chat screen and return to the game.