One of our security people is an EMT. However, we do not make it real well known. He is just there in case someone needs immediate attention before an ambulance could arrive.
We have a very safe attraction with few if any emergencies. My concern for you is that you are so afraid of someone getting hurt. To me that suggests you know there is a safety problem and expect injuries.
If that's the case you should figure out how to make it safer. Maybe use some sort of barrier to keep people from entering the wooded area like snow fencing, which is relatively inexpensive. A lot cheaper than a law suit.
I am also assuming that you have liability insurance. You are insane if you do not have coverage. Injuries at attractions put a black eye on the whole industry and you will lose those customers forever. Plus bad word of mouth will kill you. You must do your best to prevent them at whatever cost is necessary.
It is always a good idea to listen to your lawyer. They are there to help you and protect your interests. $300.00 seems very fair to make sure you do things right. I think what he is saying is that with a paramedic or ambulance etc. on site, that you are aware in the first place that there is a problem. That would could make you seem insensitive to the concerns of safety. Some could say that why would you have them on stand by unless you expected injuries. Making you look bad if it gets to court.
Prevent the injuries in the first place and then you have nothing to worry about.
1986-1997 (Mutilation Mansion,) 1998 (Screamers Haunted House,) 1999 (Evil Intention Haunted House,) 2000-2001 Concept Creator/Business Partner (Urban Legends Haunted House,) 2002 Floor Plan Designer and Consultant for a (Haunted Barn) Owners had city challenges & were never able to open, 2002 Floor Plan Designer/Construction (Fright Nights Haunted House) 2003-2012 Now retired Owner (Deadly Intentions Haunted Attraction)