Skyblock servers

So i've realized, there are NOT very many sky block servers, and when you play one you want to make your own, but you can't download maps for some reason ¬_¬, so my friend and i (Partial credit to:) Commander39 made our very own Skyblock LAN server. What we did was make a HUGE tower then trapdoors, with water, you can then go up without drowning. You then challenge your players to be able to parkour to an island when they get there you DELETE their parkour and viola they've got a skyblock survival.