TopHiking is described as 'Find and book online hiking tours with a guide on any place of the world'. There are five alternatives to TopHiking, not only websites but also apps for Android, iPhone, Android Tablet and iPad. The best alternative is Outdooractive, which is free. Other great sites and apps similar to TopHiking are Mountain Planet (Freemium), Camplike (Paid), LetsGoPlayOutside.com (Free) and Yonder (Free).
Camplike helps you find and book camps, special events where the program, entertainment and activities are already organized for you. It's a platform for organizers to share and for users to discover great outdoor activities.
Let's Go Play Outside makes it easier to find places to visit as well as share outdoor experiences. Designed to make life more enjoyable, it's a platform for outdoor lovers to get valuable information on what event is taking place, where and when.