I was there in the spring. I was also traveling alone. I arrived in Tamale with the intention of getting to Mole, but no real plan. I hadn't even booked a room at the park, which only has one small hotel. Luckily, I ran into a very decent young guy, who happened to be from Larabanga. ( a side trip you should make from Mole)
He offered to guide me and I paid his expenses, which were not much more than what my own expenses would be. Up until that point I hadn't really needed a guide, but I was glad to have one from here.
The Tamale bus station is chaotic, but my guide got the tickets and got me on a bus that I might never have found in the crush of humanity.
Worst busride ever, but totally worth it.
Then my guide took me to Larabanga and into his home. It was a very special experience for me.
Definitely book ahead, and you will have a better chance of getting in during the week than on weekends. Also the restaurant can be slow, so be patient. As for the pool, it looked fine while I was there, though I didn't swim in it. Check out the staff canteen for cheaper beer.
If you want I can give you his email. You can see more information about Mole and Larabanga visit my Ghana blog at www.goyestoeverything.com,
and you can contact me through there if you wish.
Mole was awesome, but I think two or three nights is enough. Consider that you arrive late (7pm or so) and leave early (5:am), so two nights is really one day.
Have a great trip!