Cars are around US$100 a day and would be the best way to get around the Country to check things out. Get a 4 Wheel drive as the roads can demand them once off the main highways if it's been wet. Pug must get some cheap flights to Belize. Goldson to San Pedro is US$121 return or from Municipal Airstrip in Belize City - which you'd most likely use if you explore the mainland first - it's less at US$67 return. A forum for the mainland is called Belize forums Google the exact address and it will have loads of info on mainland Belize.