Once you start posting on your blog, stick with the same domain or you could end up losing a lot of your traffic and regular readers.
If you have a number of subjects you want to blog about, start a number of blogs. For example if you have a resort with fishing and diving, start a blog for each. Chances are their are 2 staff members who run each of these activities.
For example see Matava in Fiji's blogs on fishing and diving (note anchor text here):
- Gamefishing Fiji, http://gamefishingfiji.blogspot.com/
- Diving in Fiji, http://gamefishingfiji.blogspot.com/