4k sounds in the range, but that depends on all of the X factors involved. Check laws in your state....many states very strongly protect land owners who grant others permission to use their property for recreational purposes...i.e fishing, hunting, camping, hiking, etc. You assume all the risk in your activity. Outdoorsmen (hunting, fishing, etc) in these states pushed to get these laws passed back when frivolous lawsuits were taking off. A lease is a legal agreement and would be in effect, but you could put this same language in the lease to make the land owner at ease and have the same language in your state. Good luck...take care of the owners and don't just write a check....cut grass, stock fish,teach their kids to ski, BBQ for them...that's what make these things work out.