This is exactly the reason I developed gps-saver, I had the same problem as you have. In my last holiday, I had my N800 running with gps-saver and BT GPS constantly. In the morning I started the program, had it running whole day and ended up with one file with location information for that day. The battery in the tablet and BT GPS device lasted fine for that 8-10 hour duration.

For post-processing this information (attaching location data to photos) I used gtag (https://garage.maemo.org/projects/gtag). Unfortunately the post-processing tool is not yet optimal, like what to do if the tablet clock is not the same as camera clock and what if both are different from correct GPS time. This happened to me so now I have a pile of photos and location data that are slighly out of sync but I am working to fix gtag to handle this situation.
The idea of gtag is to attach location info to photo exif data and then generate a google maps file with fotos and descriptions. This would be a journal of your vacation with photos about places where you were with descriptions. An example can be seen here http://maps.google.com/maps?f=q&hl=e...4938&z=10&om=1
I do not have descriptions part of gtag ready yet so the example photos do not have any descriptive text with them. The gtag has no UI, it is just a command line program, so it is not a nice tool to work with, some UI for manipulating the photos etc would be nice to have, unfortunately I do not have time to create UI for gtag.