Not sure about cost of taxi, but even if you pay an extra 100 pesos for the luggage on the guaugua, you should have no problem...probably best to offer an additional 100 pesos to have the guagua driver take you to the hotel reception because arriving at the LG guagua terminal on the beach with luggage is a problem, still 10 minutes away by foot from the hotel...So, for 300 pesos, you'll likely get to where you want to go....Taxi might be considerably more, but I don't know since I've always taken the gg....I always find that I take way too many clothes for my trip....just back (yesterday) after one month in LG and Las Terrenas...great time.