Corruption at it's finest?

Okay, so my 16 y/o sister is coming to Charlotte for the weekend. This has been pseudo in the planning for most of the summer but came to a stark reality this week. I had been telling the parents to figure out which weekend and gave them my class and work schedules, etc. I kinda wanted some notice but whatever. Anyway, I got a call from her this morning. Good thing me telling her this weekend would work (Monday night) and nothing changed since she called. She rattled off the itinerary and I will be picking her up about 4:30 Friday evening. Gee whiz, twist my arm for a reason to leave the office early. So now I have to figure out what to do. If the weather is nice, she wants to spend Saturday, or a better part of it, on the lake. Works for me. Heavy shopping is required as well since she has never been to Southpark and has her mother's knack for being able to blow through serious cash in a matter of a couple hours. That's all fine and dandy. I get to stare at the other women out shopping and have a valid excuse for being there. Plus I get a females opinion on stuff I need as I have a gift certificate to burn on some work clothes as well. The quandary comes down to night time entertainment. Skippy and Poot will both be here and we will want to drink. I see no problem in letting her join in but to what extent. I think part of being a good big brother is not necessarily sheltering her but teaching her some of the tricks so she knows better down the road. I am pretty sure Friday, I am going to take her to dinner and get her hammered at the apartment. Does anyone else think this is wrong? It's not like she doesn't sneak around at home. Hell, it might even be fun. I have forgotten what it is like to have a "new drunk" around. If only we could coerce Mac. Anyway, thoughts on stuff to do are always appreciated and opinions on my ideas are encouraged, especially this time around.