If the name of the game is fantasies then I have a few ideas too.
Line 1:
Upton Loop - Hamworthy - Poole High Street - Poole Railway Station - Dolphin Centre - Mount Pleasant - Poole Hospital Rear Entrance - Churchfield Road - Park Gates - Lower Parkstone - Upper Parkstone - Branksome - County Gates - Poole Road - Triangle - Avenue Road - Square - Richmond Hill - Old Christchurch Road - Lansdowne - Bournemouth Interchange - Boscombe - Pokesdown - Southbourne / Tuckton & Christchurch Railway Station - Christchurch High Street (via Christchurch Bypass on Mondays) - Purewell - Mudeford / Somerford Loop
Frequency:
Upton - Purewell via Tuckton and Christchurch Station every 7.5 minutes (every 15 minutes in each direction around the loop)
Poole - Mudeford via Southbourne every 7.5 minutes (every 15 minutes in each direction around the loop / selected journeys are extended to/from Poole Harbour for ferry connections)
Poole - Purewell every 3.75 minutes (combined)
Line 2:
BIC / The Beach - Bath Road - Lansdowne - Bournemouth Interchange - Boscombe - Pokesdown - Iford Roundabout - Bournemouth Hospital - Castlepoint - Charminster - Wimborne Road - Richmond Hill - Square - BIC / The Beach
Frequency:
Clockwise every 7.5 minutes
Anti-clockwise every 7.5 minutes
Bournemouth - Castlepoint every 3.75 minutes (combined)
Line 3:
Poole Railway Station - Dolphin Centre - Mount Pleasant - Poole Hospital Rear Entrance - Parkstone Road - Park Gates - Constitution Hill - Sea View - Newtown - West Howe (- Bearwood - Bear Cross) - Kinson - Northbourne - Wimborne Road - Moordown - Winton Banks - Bournemouth Interchange
Frequency:
Off-Peak
Poole - Bournemouth via West Howe and Kinson (not serving Bearwood or Bear Cross) every 7.5 minutes
West Howe - Bournemouth via Bearwood every 7.5 minutes
Kinson - Bournemouth every 3.75 minutes (combined)
Peak
Poole - Bournemouth journeys are diverted to serve Bearwood and Bear Cross
West Howe - Bournemouth via Bearwood every 3.75 minutes (combined)
Line 4:
Poole Railway Station - Dolphin Centre - High Street North - Poole Hospital Front Entrance - Longfleet - Oakdale - Fleetsbridge - Waterloo, then one of the three below:
- - Gravel Hill - Merley - Wimborne Market - Wimborne Square
- - Broadstone - Hill View - Corfe Mullen
- - Broadstone - Lancaster Drive - Hilltop Road - Corfe Mullen
Frequency:
Poole - Wimborne every 15 minutes
Poole - Corfe Mullen via Hill View every 30 minutes
Poole - Corfe Mullen via Lancaster Drive every 30 minutes
Poole - Waterloo every 7.5 minutes (combined)
Frequency over common sections:
Bournemouth - Pokesdown every 1.875 minutes
Frequency over common tracks:
Poole Railway Station - Dolphin Centre every 1.875 minutes
Bournemouth Interchange Eastbound every 1.875 minutes
Bourenmouth Interchange Westbound every 1.875 minutes
My scheme does depend on a few idealistic actions though, such as destroying that nasty building on the High Street called WH Smith (so that the tram can make its way to the railway station), and the removal of Boscombe Market from the pedestrianised area.
I also can't be bothered with branches into the rural areas as I suspect there would never be sufficient demand there to warrant light rail operation.
(Crikey that took me seven hours to do so you must have been fast making it in half an hour.)
Linky