To see what campus life is like I suggest examining the student newspaper
https://poly.rpi.edu/
As far as collaboration the research page may have some descriptions of interdisciplinary research. This is how most departments collaborate. To see how the collaboration works between classes I would e-mail the Provost. I am not allowed to post the e-mail here, but going through the course catalog to try to identify cross listed courses would be time consuming. If you e-mail the Provost I suggest asking for specific examples.
As for everything else you need to be committed to both CLASS and ARCH before deciding to attend. These are RPI highlighted programs. If you read Reddit you will see mostly negative comments (positive would not be expected). I hope this helps.