I'm currently an Aeronautical/Mechanical Engineering freshman at RPI. The core engineering program is the same for freshman, so I can help a little
1) I am going to look at RPI, Drexel, UMD, and BC. If anyone has gone to these colleges, what are they like? How was your experience?
I like RPI. This is a pretty broad question, so I'll give you some pretty broad answers. Anything more specific feel free, PM me.
The classes aren't too bad. If you keep on top of things, it should go relatively smoothly. I have AP credit for Calc, Chem, & Physics, but my friends who are taking them are doing pretty well, and they seem pretty standard There are lots of clubs for the engineering types (I'm currently in Solar Car, Design/Build/Fly (we design/build/fly model airplanes for competition), and E-club (open access to the electronics build lab, currently involved in a high altitude weather balloon project). The food is pretty good for mass dining hall food (significantly better than the food was at my boarding high school). Troy is a sketchy town, no way around it. On campus, however, is perfectly safe. Public Safety does a great job.
2) Does anyone have colleges that you would like to recommend, that have Biomed. Engineering as a major?
3) Any ideas of classes that I should take in senior year?
I assume this is senior year in high school? If you're in the position to do so, taking AP Calc BC, AP Physics C, and AP Chemistry is a huge help. It essentially knocks out most of your freshman year, letting you do things you're interested in much faster. At the start of my sophmore year, I'll be taking exclusively junior year classes in my major. Doing all 3 at once, might be a stretch, I took Calc BC & Chem as a junior, and Physics C as a senior. Be sure you actually get a good understanding of the material. RPI requires a 4 or a 5 for credit, but if you feel like you don't get a very solid understanding of the material, take it over again in college.
This is the program for Biomedical Engineers at RPI
If you don't have AP credits, then just take the hardest physics, math, and chemistry that you can.
Hope that helps!