It's not unfriendly to tourists, but:

1. It's loaded with elitist, standoffish crunchy people (think Portland) and hippies everywhere
2. There are roosters everywhere, and they crow 24hrs/day so good luck sleeping
3. There's literally nothing to do on the island other than hike/snorkel and very few good restaurants
4. The airport sucks
5. Everything is significantly overpriced for what you actually get. Stayed at the Grand Hyatt which had exceptional grounds and amenities but the rooms were literally less nice than some Hilton Garden Inns I've stayed at and they start at $1k per night for a studio