The children in day camp have a wide variety of activities from which to choose: arts and crafts, to go boating, or indoor sports.
The children in day camp have a wide variety of activities from which to choose: arts and crafts, to go boating, or indoor sports.
The correct answer ensures parallel structure in the list of activities. 'Arts and crafts' is a noun phrase, so the other activities should also be presented in a similar noun form for consistency. 'Boating' and 'playing indoor sports' are both gerunds and fit well in the list. Therefore, 'arts and crafts, boating, or playing indoor sports' is the most grammatically correct option.
arts and crafts, boating, or playing indoor sports