You can take the water taxi to Gombe National Park. It leaves daily at 2 pm, but I recommend you get to the port a little early so you get a good seat. One not facing the sun, and near a cross beam upon which to rest your feet.
You can also rent your own boat if you have limited time or unlimited resources.
You might also walk to Gombe. Last week we flagged down a taxi that took us thirty minutes outside of town on a road that curves just east over the hills from the lake. We told the driver to stop just before the market, where a footpath cuts west between two houses, in the yard where palm nuts are laid out to dry.
We started confidently out of the car.
"Here?" the taxi driver confirmed. "just right here?"
"Yes," we called back.
"You sure?"
"Yes, we know the way," and shouldered our bags as we got out of the car. The path moves up and down, through fields, between houses, across rivers on fallen trees, splashes through streams.
The first person we met who stopped short and greeted us was a mother with two young children, all three carrying firewood on their heads. She turned slowly, maintaining her load's balance, as we passed.
"Where are you going?" she asked.
"Gombe."
"You know the path?"
"Yes."
"Well," she said slightly skeptical. "Ok then." And let us on our way, fairly sure that she'd still find us lost on her trip back that afternoon.
The second person who stopped for us was a mother with a child in her field, digging potatoes.
"Good morning!" her round face beamed, her eyes crinkled, her hands still on the earth. "Are you going to Gombe? It's just straight on this path, just straight up here till you reach the mountain."
Straight? Her vision of a path making a bee-line for the Gombe border was different from what we saw--an endless string of identical paths that spun around in circles. She waved us on our way and we continued along.
The third woman we met was a grandmother walking slowly with red palmnuts on her head, her slight frame bent at the waist, her head back to balance the load.
"Where are you going?" she asked after a pause.
"Gombe," we replied.
"Gombe?" she repeated.
"That's right."
"Well. You're headed to Mitumba." She turned us around and pointed us to the proper path-- left at the fork in the road, not right, over the stream and up the hill.
We made it eventually. I'm sure I'll remember the path next time. It's just straight in the village, through the river, and up over the hill.