It can be a bit confusing because it's in the Site's title but...Costa Rican women are Ticas; all the women we associate with are Chicas, wherever they come from. Confusing the 2 words can get awkward.
About lodging: agree with the above. Two venues that might not get you "outed" as a Monger are the Hotel Santo Tomas (maybe--check with them on Chica fees and policies) and the Hotel Hemingway. Both offer discounts to paid VIPs here (check the VIP Discount Thread for details, current promotions, etc) and the Hemingway is not generally known as a Monger hotel, at least not yet (mostly backpackers). Speaking of which, there's a straight-up backpacker/Euro hostel close to the action--from the pix, they have good parties around the rooftop pool--might be worth checking out with the younger guys in your group--Hostel Pangea.
http://www.hotelsantotomas.com/http://www.hemingwayinn.com/http://hostelpangea.com/