We had a great three days in Slovakia. First day we rode in Malino brdo bike park, and then we visited Martinske Hole. To explore local trails above Žilina and st. Martin. Trails are not suitable for beginners, because all of them are steep with roots, so you have to be comitted. For uphill we used shuttle car, and we were guided by local riders who were great, and I recommend everybody who ride there to pay locals so the can show you trails, accommodation, cuisine and company. Send my email and I’ll give you contact if you are interested in repeating our trip.
I also put gpx file of our rides on Martinske hole. (second day is without uphill).