To say what you are going to do, French uses the near future: the present of aller followed by an infinitive. Je vais visiter le musée means 'I am going to visit the museum'. It works exactly like the English 'going to' and is the most common way to talk about the future in everyday French.

Conjugate only aller (vais, vas, va, allons, allez, vont) and leave the second verb unchanged in the infinitive: Nous allons manger, Elles vont sortir. Time words such as demain, ce soir, la semaine prochaine often go with it. Put ne ... pas around aller to make it negative: Je ne vais pas sortir.

With reflexive verbs, the pronoun goes right before the infinitive and changes with the subject: Je vais me lever tôt, Tu vas te coucher tard. The classic mistake is to conjugate both verbs (je vais visite) or to forget the infinitive ending. Also remember that aller can mean both 'to go' and 'to be going to': Je vais aller à la plage is correct.