Unwind close to San Juan's famous historic district with this third-night-free deal. Plus score a $75 food and drink credit per stay and free room upgrade based on availability at check in.

Regular rates at Sheraton Puerto Rico Hotel & Casino are $219-$299, but the free night cuts the effective rate down to $146-$199 for now through September and Nov. 1-23.

Lounge at the hotel's fourth-floor infinity pool, test your luck at the casino (with more than 400 slot machines and 16 table games), or unwind at the spa. The hotel also has a restaurant and two bars.

Note: The free night will be applied at check-out.