It helps to love history when you're here because the country is steeped in it, but if you don't you will still love the castles. Besides the timeshare being one, nearby are Glamis (pronounced "Glams") castle, where the Queen Mum grew up, and which although open to visitors, is still occupied, Stirling Castle, former seat of government, and a little farther, Balmoral.
Don't miss a day in Edinburgh, including a tour of the Royal yacht Brittania. Spend a few hours in beautiful St. Andrews, and any of the numerous fishing villages along the Fife coast, e.g. Elie, Crail, St. Monans, and Pittenweem(love that name!).
Quick Tips:
Request a castle suite at the Kilconquhar Castle timeshare, and the friendly staff will accomodate if possible. The villas are very nice too, and modern, but don't you want to tell your friends you stayed in a Scottish castle?
Bring a warm jacket when you tour, as the wind off the North Sea can be quite cool even in spring or summer. Eat in pubs, there are lots of them around, and they're the least pricey in a fairly expensive country.
Best Way To Get Around:
A car is essential to get around. There are bus tours from the timeshare, but they can get a little pricey for more than one person, and you lose the freedom. In Edinburgh, watch where you park (become familiar with the painted markings) or you WILL get a ticket. Better to park on the outskirts and take a bus in to town. Most things on the Royal Mile and Edinburgh castle are walkable if you're fairly fit.