Formal:
* J'aime beaucoup mes amis. (I like my friends very much.) This is a polite and neutral way to express affection.
* J'ai beaucoup d'affection pour mes amis. (I have a lot of affection for my friends.) This is a more formal and sentimental way to say it.
Informal:
* J'adore mes amis! (I adore my friends!) This is a very affectionate and enthusiastic way to express love for your friends.
* J'aime mes amis plus que tout! (I love my friends more than anything!) This is a very strong and heartfelt way to express your love.
More specific:
* Mes amis me sont très chers. (My friends are very dear to me.) This emphasizes the importance of your friends to you.
* J'ai beaucoup de chance de les avoir dans ma vie. (I am very lucky to have them in my life.) This expresses gratitude for your friends.
You can also use a more specific phrase like "J'aime mes meilleurs amis" (I love my best friends) or "J'adore mes amis proches" (I adore my close friends) to emphasize the type of friends you're referring to.