A nice bimble for an hour you could fly down the great glen to drumnadrochit, head north towards cannich, then follow the valley back towards beauly, fly along the cromaty firth to the gap then call for rejoin. Takes exactly an hour blocktime. Local airfields nearby are Knockbain farm just outside Dingwall and Fearn just outside tain. However, if you want to actually go anywhere...
Heading north you have Dornoch which is a great little grass strip, and it's located right by the town so you can stop off for a spot of lunch. It is a popular place with dog walkers though, so it's probably a good idea to do a low fly-by before landing.
Further up the coast, you have Wick, but why anyone would intentionally go to Wick is beyond me, but hey! If you are a bit more adventurous, you could head over the Pentland Firth and pay a visit to Orkney. Kirkwall is a short taxi ride from the airport and is a cracking wee town. If you have a bit of time, then you can visit some of the islands and if I recall correctly, you can buy a landing card for all of the airports on the Orkneys.
Shetland and Fair Isle are over a bit too much water for a single engine putt putt, but if you like bird watching you might like to risk it.
Heading west, you can visit the hebrides. Stornoway has a huge runway and a bus service into town. The town is not much to talk about and what ever you do, don't go on sunday as the whole world grinds to a halt. Flying down the hebrides is stunning on a good day, and no trip would be complete without the obligatory landing at Barra. There is another beach airfield on Sollas, but there is absolutly nothing around so would give it a miss.
A quick hop back over the minch and you have Plockton and Broadford. Both good places to start for a trip around Skye. Further down the coast you will have Oban which I believe is a thread all on it's own. If you do get down there, try and fly over fingals caves as they are quite a sight.
Eastwards there aren't too many airfields available, a couple of farm strips near to lossiemouth and a glider field. If you persist in going this way, you will eventually end up at Aberdeen. If you land there, I suggest you remortgage your aircraft to cover the landing fees and handling.
South is towards the Cairngorms, nice scenery, especially in winter, but, apart from feshiebridge glider site, nowhere to land.