Slomom, Easy is relative
Christmas '03 my two kids (12,9)and I used the bus several times. What memories
You need to be patient, wise and tolerant. I'd do it again.
There is an Express btwn Belize City and SanIggy that leaves BC about 11:00. You have A/C and assigned seating. It makes no stops and that's my plan each way. The express takes a lot of the chance out of the picture. You just need to get to the bus station early to secure your seat.
Last visit, from AC we rode the 7am boat to BC then a $6bz taxi to the bus station. We hopped the milk run to the zoo. After our 2hr zoo visit we hopped onto the next one to Belmopan and transfered to the southern bus the nine miles to Ian's Cave Branch jungle lodge for several days. Then took a northern bus back to Belmopan and transfered to a western bus to SanIggy and Marthas for a night prior to our three days at Tikal. Coming back from the border we rode the bus back to BC and the Thunderbolt back to AC. Several times the bus broke down, everybody waited for the next bus (30 min) and boarded it. Remember the busses we rode to school twenty years ago? Well there all in Belize and they can get eighty people on one bus for a sweaty four hour ride from boarder to coast. I think it was like $5bz per person.
When I researched our trip the resorts charged big money to drive you in, and if I had big money, I'd take them up on there offer.
Travel early in the day, have flexable plans, and be tolerant. Enjoy, Jeff