let's face it if this works out as more than a summer thing there are going to be lots of times when you are in the position of doing things without each other. Go with your friend - it sets a bad tone to back out because of your budding relationship. (If it conflicted with time you could be spending with her that would be different.)

Assure her everytime you talk to her before you leave that this is about spending time with your friends and the first time you talk to her afterwards let her know that it was a nice place and you can't wait to share it with her or that even her company couldn't have salvaged the evening - when you go dancing you will find somewhere better to go. (Comments like that let her know she was on your mind while you were out.)

And if some girls hits on you - if you opt to share that information you get a 10 yard penatly for over-sharing. It will not secure her fears to know you didn't fall for this chick - it will confirm her suspicions that other chicks are going to be after her man!

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I think the mistake a lot of us make is thinking the state-appointed shrink is our friend. - Jack Handy