Got Invited to Tour a Lab for a Research Project

[scalebound]

So finally got what I hope will turn into something good.  One of my undergrad professors who has been contacting me about a possible research project that involves restoration of meadowlands in CA was interested in me as I'm going into soil science.  Unfortunately didn't get accepted into the first project he had going, which involved almond trees, but this one seems more promising since one of the students he hoped would join rejected it for another offer.  However I was not near his second choice or directly competing with anyone else.  In the meantime, he invited me to tour his lab, meet the lab members, and discuss the project with him later this week.  He said it was meant to be a low stress thing and not involve a formal interview.  Since this might be my only chance of going to grad school even at my safety school, I could use some advice since I want to make the best impression and show my enthusiasm for the project so that I can get my foot in the door. 

[rising_star]

I'm not quite sure what you're asking. In general, be yourself, ask questions, try to not to blabber on in your answers, and don't drop any f-bombs.