definately need 4* or above - the dom rep is notorious for tummy problems from dodgy food in 3* hotels. Its always the cheapest caribbean option but if they stick to 4* up they should be ok. as with all caribbean islands its not a safe place if you wander off the beaten path or flash jewellery around - common sense is needed as always. Some good hotel chains are RIU and Occidentals, they should be pretty safe bets.