If you are looking for a good place which can help you schedule exploration trips while providing clean rooms, a pool and a good restaurant then I would suggest Cahal Pech which is just up the hill from downtown San Ignacio. The view especially at night is spectacular as you look out over the city and towards Guatemala.
They can help you with any adventure including a trip to Tikal. You can do Tikal in one day but it is difficult and exhausting so I suggest stay one night at Le Casa De Don David which is in El Remate, Peten just outside the Tikal National Park.
The buses back to Belize go right by the front door so you are sure to catch it.
David and his wife and daughter run the place. The ruins in Belize and in Mexico are great but Tikal is second to none.