For around 200 USD a night you can enjoy 4 star hotel experience just 2 hours from central Accra. Royal Senchi has a lovely poolside bar/restaurant with a nightly live band. The breakfast and dinner buffet is on par with other 4 star hotels in Accra like the Movenpick.
You can jump into a hotel sponsored kayak or canoe for free and take your own tour up the Volta river. If you are feeling adventurous you can have the Akosombo bridge be your final destination.
Insider tip: the drinks in the mini fridge are free with your hotel room price.