i hate temperature scan missions, or the ones in general where you have to go to some specific location at a specific altitude and speed and do something. they're never worth the effort.
i don't have anything except KER downloaded and only about 15 hours or so since friday. i haven't even turned on the R&D boost because i've been collecting the cash. did you know that you can walk/buggy around to every building in the space center and do a crew report, EVA report, and plant flags and take soil samples at each one for huge amounts of early-game science? that should be one of the very first things you do. i also load up any flight where i expect to go somewhere new with the science bay, goo canister, thermometer, barometer, etc. crew reports too. you can do all of these each time in both levels of the atmosphere, and in both low and high orbits of kerbin and both moons. in low orbit each time the biome you're above changes (another handy use for KER is that it tells you exactly what biome it is at all times) you can do a 3-second EVA report for each one. between kerbin and the mun there are at least 12-15 different biomes and another 4 or 5 on minmus. EVAs in high orbit of mun and kerbin too, of course. every time you land on a new biome, the EVA report/flag/soil sample routine gets you 15-20 science alone. and now that there is that super-useful new science return box in 1.2 you can get lots of extra science by returning every experiment rather than transmitting the data. only other thing i do is make sure to look for contracts if i'm going for a new flight milestone, if you can get a contract to "explore the mun" on the first flight you intended to send to the mun anyways, those usually bring back a lot of points too.