30$ is only guide charge.

The ticket fee is 90,000 vnd (4,5$), included entrance fee and some delicious cassava

The bus fee is only 30,000 vnd (1,5$)

It takes 2,5 hours to get there by bus.

If we go in a group, i recommend renting a car. It would be faster and more comfortable to go by car.

There's a very nice large swimming pool in Cu Chi tunnels' area. You'd better bring the swimsuit if you like swimming. And hats or umbrellas too, if you dont want to get sunburn.

I hope these information is useful for you. I'm very friendly and willing to help. Feel free to contact me.

Cheers!