Once you've started making a profit, try making the first of the ten roller coasters as a cheap type, such as a Steel Mini Roller Coaster or a Wooden Crazy Rodent Roller Coaster. To increase excitement, keep building the track near other tracks (over and under itself), and build the track near other rides and pathways. Also, add tunnels and decorate the station. You may need a second lift hill to keep momentum for the whole 4,000 ft. of track - this invites to building a second station as well, since that increases the capacity. After the first test, keep refining your coaster until it meets the objective. Such a long and exciting coaster easily deserves a price between $5 and $6.