What's a good, strong sweet drink that doesn't knock you out?

I'm organizing my female friend's b-day party for Feb 18th. We're mainly into sweet drinks that can be strong but not too much too knock you out.

I hate beers and bitter drinks; never liked them. What's a good, strong sweet drink that can make you tipsy but not too drunk. We want to feel the effect a bit but stay alert the rest of the night to enjoy the party.

What's a good, strong sweet drink that doesn't knock you out?
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