La Romana-Cueva de maravillas-Santo Domingo

Hi,
is it possible to make a trip from La Romana To Santo Domingo, stopping at Cueva de las Maravillas, using guaguas or other public transport (not motoconchos)? Or any organised coach trips there from La Romana?

Worst case scenario, how much would be a cab (roughly) for this journey with a 60 minutes stopover at la Cueva?

Thanx a lot,
Sve

thanks anyway, hopefully will find some way once I am in la RD- flying tomorrow- yippie