Hi Ting, 

When associated with food as in this exercise, the verb 'se régaler' is always tricky to translate. To really enjoy is the closest , but it actually means a lot more in French, like -

' I am going to really enjoy this delicious food, it's going to be a real treat!'

which is not quite to feast in English as it could be said about a simple dish that you really enjoy eating.

Hope this helps!