I want to go outside.
Do we say
(a) Ich will nach draußen gehen.
(b) Ich will zu draußen gehen.
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Ich will nach draussen gehen.
All those preposition based locational adverbs work that way... drin, links, rechts, oben, unten etc.
Or a shorter version is:
Ich will rausgehen/raus gehen.
If you're talking about going for a walk or get some fresh air, then this would be the more idiomatic choice. The first one is more suitable if you're talking about the outside of a particular venue.