Parallelism Basics

If both sentences are in answer choice, I prefer first "I like to eat, dance and swim".
It is consice and streight to the point.

Hello again, charlie138. I would like to add to my earlier post that I would expect to see the infinitive marker to if its omission in the series might lead to confusion. For instance, a similar sentence might begin,

I like to eat a snack before I dance...

I would not place a comma and the word dance right after the first element in the series, but would indicate the second element by adding another to:

I like to eat a snack before I dance, to dance as fluidly as my teacher...

Finally, since the first two elements of the list begin with to, I would introduce the third in a similar (parallel) way:

I like to eat a snack before I dance, to dance as fluidly as my teacher, and to swim as gracefully as an eel.

You have to lean on contextual clues to make a determination sometimes. Again, in isolation, I would go with the more concise sentence you offered in the original post. But do not follow recommendations blindly. The clear expression of vital meaning should be your top consideration in SC.

- Andrew