My labor math keeps landing above their budget on a season contract

Scope that creeps back in verbally in July is the entire problem and stripping the site checks will not save you unless the contract names who does them instead. Write the exclusion as a line that says site checks and trash runs are performed by park staff, and add a rate for out of scope work, hourly, invoiced monthly. Then when the manager grabs your guy in July you have a number to point at instead of an argument.

The other thing I would question is your 1.25 hours per cabin turn. That is fine for a clean turn on a small cabin, and it falls apart the first time somebody leaves a fire pit's worth of ash on the porch or a dog has been in there. On renovation work my ratio for the bad ones to the normal ones is about one in six and the bad one takes three times as long. Run that through 570 turns and you pick up another 190 hours, which is 4,400 at your loaded rate. Your 88k is probably 93k.

Bid 112k and let them tell you no. A contract you lose costs you nothing in October.

The camp host stipend is the line I would not carry on your side of the ledger. On the management side we push host arrangements onto the owner every time, because the host occupies a site, gets a benefit in kind, and depending on the state that arrangement can look like employment with wage and hour exposure attached to whoever is paying the stipend. Whether a camp host is an employee is a state law question and worth one conversation with an employment attorney before you sign anything that puts them on your books.

If the owner employs the hosts directly, your bid drops by 15,600 to about 77k of cost, and 96k suddenly has a 20 percent margin. Restructure the bid that way and present both versions, with hosts and without. Owners often say yes to the version that looks cheaper on your invoice even when it costs them the same money.

One more thing on your hours. You blended cabin turns at 2.8 a week from their numbers. Ask for the reservation export rather than taking the average they quoted. Owners round up occupancy when they are talking to a buyer and round it down when they are talking to a vendor.