not comportado en vez de portado?

>Final presentation coming up real soon and I could use some help with colloquial spanish.
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>>Situation 1: You're talking to your grandson and tell him that you've got a present for him if he's been good. His reply is "I've been good."
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>>What would be the most gramatically correct translation and what would the child actually say?
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>>(Probably the most difficult topic for me so far has been the varying past tenses. Can't get it through my skull which one to use when).
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>His reply would be:
>"me he portado bien"
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>>Situation 2: At the end of your three minute set at open-mic night at your local spanish class (errrrrr.........comedy club), how would you say
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>>"Don't forget to tip your servers"
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>The word 'server' or 'waiter' depends on the country as there are differences in Spanish. Maybe the following:
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>"No olvides de dar una propina al mozo"
>"No olvidar de dar una propina al camarero"