I believe u must be coming from bangalore so u can follow this itinerary -
for chikmagalur 2 days will be enough.... places to visit :
1. baba budangiri
2. z point at baba budangiri
3. mullayanagiri(highest peak in karnataka)
4. hirekolale lake 5. jhari waterfall(must visit... u have to go by share jeep, the waterfall is covered with the coffee plantation) the go to sakleshpur(1 day will be enough), places to visit:
1. manjarabad fort
2. bisle view point
3. magahalli waterfall then if u want u can visit beach area like mangalore and udupi or u can go to madikeri(coorg) i.e. a hill station.
mangalore:
1. tannirbhavi beach
2. panambur beach
3. someshwar beach
4. have authentic gudbud ice cream from pabba's ice cream cafe (mangalore is the ice cream capital of india) then u can go to udupi(50kms from bangalore)
visit st. mary's island that is a very beautiful island .
2. maravanthe beach (one side river and one side beach) I had been in mangalore for 1yr u can ask me if u want to know anything else.