Here are my thoughts....
$1,000.00 Maint (In 120 days you might have 1 oil change or a whole engine)
$3,600.00 Camp Fees (in 120 days that is only $30 a night) a little low.
$2,000.00 Fuel (Is only $0.38 cents a mile... I average $0.45 with a MH)
$100.00 Propane (No comment)
$2,000.00 Admission (Don't know what you want to see so cannot help...Disney Land is like $200 a day per person so that is only 10 days out of 120 ???)
$800.00 Restaurant ($6.66 per day ?????)(Only 1 time in 5 days for 2 people)
$500.00 Hobbies (No comment)
$10,000.00 Total (I guess this is on top of whatever your normal at the house 4 months costs would be).