Oh well in that case - no it wouldn't put me off at all that you planned a trip to Europe on your own. To me that shows confidence and assertiveness which is a good thing.
Now if you were taking someone along and never asked for their input in the planning at all and did it all yourself, then that might be seen as a bit annoying. However one exception is at the last minute you call me up and ask me to go - I won't be annoyed one bit!