We have a mortgate with 100% offset and are renting the property out. We're also pretty good with money so the amount in offset seems to keep going up. The ever reducing interest is good, but I feel we can be even smarter with that money, we just don't know how. Buying more property is not an option due to our current employment situation (better than it probably sounds but the banks wouldn't be keen). The next obvious option is shares/forex, and though we're not at all experienced with those, we can always learn.
Are there any other investment options? Is the offset likely the best for now?
What would Ozbargain do?
Given the tone of your question, the offset account will be best for now.
Get a subscription to Money magazine or start reading the personal finance pages in the newspaper to begin the process of learning about alternative investments.
When you have a bit more knowledge of the possibilities, a visit to a financial planner would be a good idea.