Should we bring hard-shell suitcases?

No. Use soft-sided backpacks or duffels. Hard-shell cases are difficult to fit into the overhead compartments of puddle-jumper planes and the trunks of small shared shuttle vans.

Is it worth bringing hiking boots?

Only if you have serious ankle issues. Most trails are muddy or wet; high-quality trail runners dry faster and provide better grip on slick rocks than heavy leather boots.

Packing for a Costa Rica Adventure as a Couple

Share the load by designating one bag for shared technical gear and one for personal clothing. Aim for one 45L-50L backpack each to keep mobility high for bush planes and small shuttle boats.

Consolidate the tech and meds. Instead of bringing two sets of chargers and two first-aid kits, combine them. Use one dedicated electronics cube for all cables and cameras, and one dry-bag for shared medical supplies like Imodium, motion sickness pills, and high-strength bug spray.
Strategize for the microclimates. Costa Rica shifts from humid jungle to cool cloud forest. Pack one base layer (merino wool) and one lightweight waterproof shell per person. Do not bring heavy jackets; rely on layering.
Limit the footwear. Each person needs exactly three pairs: one pair of aggressive-tread trail runners for hiking, one pair of secure sport sandals (like Tevas or Keens) for water activities, and one pair of flip-flops for the beach/hotel.
Use color-coded compression cubes. Use one color of compression cube for your clothes and another for your partner's. This prevents the 'who packed what' chaos in small lodge rooms with limited shelf space.

Should we bring hard-shell suitcases?: No. Use soft-sided backpacks or duffels. Hard-shell cases are difficult to fit into the overhead compartments of puddle-jumper planes and the trunks of small shared shuttle vans.
Is it worth bringing hiking boots?: Only if you have serious ankle issues. Most trails are muddy or wet; high-quality trail runners dry faster and provide better grip on slick rocks than heavy leather boots.