My 10 year old and I will be in Belize next month. We will rent a car in BC, and head out toward San Ignacio. We travel a lot, and always rent a car--we prefer the flexibility to see places at our own pace, without participating in organized tours (it's also usually much cheaper). Can we do this at ATM or cave tubing, or is a tour (departing from San Ignacio) required? Thanks in advance!