SPOILERS:
you should be able to find the various girls at the locations given on the map (except for the dock and mall). the only confusing thing I came across was the pink cat girl and elf. In order to get the elf girl, you need to unlock the cat girl. You can find her at the park during nighttime, and in order to date her, you need to give her a magical crystal that's able to be found in the garbage bin by the bench in the park. From there, keep dating and you'll eventually be able to meet the elf girl at the cat girl's house.
best of luck, man!