City Walk Toddler Town: Turn Your Party into a Mini Metropolis! Calling all pint-sized adventurers! Introducing the City Walk Toddler Town, the inflatable playground that'll transform your party into a bustling metropolis of fun! Rock Rental charges 5% for credit card payments, no additional charge if paid by cash or check. Rock Rental's delivery fee is based on $2.00 per mile round trip without a trailer and the travel fee for 1 vehicle towing a trailer is $2.50 per mile one round trip from El Cajon with a zip code of 92021. If the location does not have a power source within 100 feet of the back of the unit, you will need to add a generator to your reservation.