Mountain biking is relatively new in Panama. There are few places suitable for riding other than well-established paved and dirt roads, but many of these roads can be dangerous if there is a lot of vehicle traffic. Roads in Panama are curvy, often with hairpin turns, and do not have bike lanes or a proper road shoulder, so keep alert for speeding vehicles coming around a bend. If you just feel like getting out and pedaling around town, you'll find bicycle rentals in more touristy areas that rent for an average of $10 a day. Specific bicycle-rental shops are listed under the region where they operate. There are no tour companies (yet) that offer multiday packages that focus entirely on biking; however, the operators listed below can custom-build a trip for you.
In Panama City, the most popular and safest bike-riding area is the Amador Causeway, which is flat and has bike lanes -- and a pretty spectacular view to boot. Outside the city, the Gamboa Resort rents bicycles for touring around; from here it's a couple of kilometers to the Pipeline Road Trail, a dirt-and-mud road that is flanked by tropical jungle. El Valle de Anton was made for bike riding: Vehicle traffic is light, roads are flat and paved, and a few steep, technical dirt roads offer a good workout. Boquete, too, has picturesque, winding roads that provide moderate terrain and pastoral views. Note that rental bicycles around Panama are not top-of-the-line models with shocks and other deluxe fixtures.
Adventures in Panama offers two bike day trips around Panama City. Their day excursion to the Pipeline Road Trail gives cyclists a chance to get (a little) dirty and ride through jungle at one of the best bird-watching sites in Panama. Across the isthmus, they offer a day tour that begins with a bike ride across the Gatún Locks, connecting with a 6.4km (4-mile) dirt road to Fort San Lorenzo, a road known for birds and wildlife. The company Bike Hike Adventures combines biking on the Amador Causeway and near Fort San Lorenzo as part of their multisport package trips.