An offer for my parked domain @ $8000!

About a year ago I went on a domain buying binge @ GoDaddy and then setup them up on a system that was supposed to bump up my PR and forgot about them for a year. Renewal came up so I checked into them and yup, got ripped off again, no PR on any of the sites at all, no traffic even, they were making false stats to show me those creative but slimy buggers.

I dumped all the bad domains and kept about 10 and parked them until I could find time to build them one by one. Then, something really cool happened, I got an email for one of my premium dot coms and he asked how much I was selling it for? Dunno, not into the buying/selling of domain game so I replied and asked if he was willing to make an offer so I can consider it.

He came back and gave me a ball park figure of $8000USD but I would have to get a certified domain appraisal from an approved company before he would consider it. Now my wife thinks I should sell it and cash in but I'm not in a hurry and the reason I'm here is to generate money on an on-going basis, not just a one time cash deal.

It's a travel related domain that targets a small niche (specific location that has lots of tourists). If he is offering 8k for it then x10 means he could make close to 100k with this site easy if done correctly.

How do I keep my domain and make that kind of money? Would it be best to write articles and sell affiliate products? How about adsense? Seems like those wouldn't make that much money. So then do I put a travel search affiliate on the site or contact some hotels directly in that area and rent them the site once I get high rankings with it? Questions, questions, questions, but I hope you get the sense of what I'm trying to ask?

There are oodles of different ways to monetize a travel website, what way do you suggest I go about based on what I just told you?

Thanks for your suggestions!