If this is your first time, and with a party of 4, I'd check first to see whether there is a taxi that is at the hotel - some hotels have drivers there during the day, waiting for fares, although I don't know about Charela. If it costs you an extra $10 for additional comfort and convenience, it's not that big a deal really. You're already staying in a relatively upscale place, and going to a relatively expensive bar. Might as well make it easy all around. A route cab converted to charter for 4 people is going to be $12. each way anyway.