If I were to have a Bachelor Party on the North Coast, I would...
Search AirBnB, Homeaway etc. for a villa. Nothing too nice, in an older gated community.
Post on the
Everything Cabarete and
Everything Sosua Facebook Pages asking for:
A taxi that can pick you up at the Airport in Santiago, and return you. This taxi would also be your driver for the entire stay. Negotiate a price for the week.
A maid to clean the villa, if one is not included.
A chef to do all the grocery shopping, and cook dinners for you stay.
I would rent a couple four wheelers, that'd be fun, you can also ask about this on FB.
Over a week, I'd probably spend two nights partying in Sosua, two nights in Cabarete, and 3 nights at the villa
If prostitues were going to be a thing, I would NOT allow them to come to the villa. I would rent an apartment close to Sosua (cheap, maybe $200 for the week), and kick her out the second my business had concluded.
Do a couple tours through one of the operator,
Iguana Mamma, and spend any empty time at the numerous beaches.
Tell ya what, invite me and I'll plan it all out for ya!