Splatmandu, Hellsurvivors, Futerball and others. This is still one one of my favorite fields.
First let me say I've play most of the fields in the southern parts of Michigan and am not a paintball newbee by any means. That being said Excalibur is still one of my favorite places to play.
If you haven't checked it out this field yet I HIGHLY recommend you come out and join in on one of their Big Games. The refs are good at their job but still laid back and make things fun. Last year one ref borrowed my TPX and shot his buddy in the rear to get him back from a practical joke earlier. Funny, but yet when it comes doing their job they are all business. I've personally never had the problem of a ref not being there when you need them or being lazy and not doing their job.
The staff and owner are all very knowledgeable and make playing there a great experience. The field itself is AMAZING. Excalibur still without a doubt has the best castle I've seen on any field and I've had many a great times defending it and storming it. I have one fond memory of being down in the castle's tunnel and holding off 20-25 blue's who had taken the castle but couldn't route me out of it's tunnel :) The field has sooooo much variety and it's just the right size, not to small so as to be boring but not to big that when you get shot out you're like , "Man, here we go on that 20 minute walk to the staging area." There are trails and plenty of cover and at different times they bring out the tank to travel around the larger main trail that circles the field. I remember once the driver backing the tank up and into the castle's front door to try and give the loosing team an edge to take the castle. Nothing like thinking your safe behind four walls and then looking down the twin barrels of a paintball turret! Can you say run for cover!
The other main base is the Asian village and is very well laid out. As i sit here and type this I realize I just can't explain in words amazing this field is. You'll have to come check it out to see. If it's your first time grab someone who knows the field and run with them to get the general idea but after a few times you'll have the basics. Don't worry about playing here to much and getting bored with the field either, after playing there 3 years I'm still finding new little surprises to the field and coming up with new stratagems that make things interesting and look forward to my next time on the field.
My best memories in paintball still reside at this field and I hope someday yours will too :)