Castillo San Cristóbal, San Juan

Admission costs $10 for adults, but kids under 15 can enter for free.

If you're a veteran, you can enter for free by showing proof.

Admission is $5 for adults, and kids under 16 are free. If you have a national park pass, it works here too.

Entry costs $10 for everyone above 16, so plan accordingly.

Look for signs to guide you up to the fortress; they are quite helpful.

Wear good shoes as the walk to the fort includes cobblestone streets and some uphill sections.

The best views of San Juan can be enjoyed from the top of the castle, so don't miss that.

Plan your visit to catch the cannon firing demos, which can be a fun experience.

Be prepared for a bit of a climb; it keeps you fit and offers great views.

Take your time to explore the beautiful surroundings and enjoy the views.

Make sure to check out the old cannonballs displayed in the fort; they give a fascinating insight into the fort's history.

Expect to encounter some damp conditions inside the castle, especially on rainy days.

Be prepared for some interesting tunnels that are part of the fort's defense system; they add a unique experience to your visit.

The fort is a National Historic Site and a UNESCO World Heritage Site, so plan to spend a good amount of time exploring its rich history.

Make sure to visit both Castillo San Cristóbal and Castillo San Felipe Del Morro for a full experience of the area's history.

Be prepared to walk a lot as the fort covers a large area with many interesting features to explore.

Make sure to explore the secret tunnels and lookout points for breathtaking views of San Juan Bay.

Make sure to explore the views from the fortress; it's a great experience for everyone, including kids.

Plan your visit early in the day to avoid crowds and enjoy a more peaceful experience.

Expect a mix of visitors, as tours spread out the crowds throughout the day.